Malicious PDF — malware analysis report

Static analysis result for SHA-256 2905ba7fb8824653…

MALICIOUS

PDF

111.6 KB Created: 2021-07-05 19:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f2bc7759b4dba96e5cf336a7f8ffa14 SHA-1: 2c15d4cbeb6df87b180d27788136f9c1c787c32c SHA-256: 2905ba7fb882465349d31ca532ca9a8501d2abbc309fc893e8854ad0756f94f6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution attempt, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9760

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=vocabulary+workshop+level+d+unit+2+completing+the+sentence PDF link annotation
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/niwifirigababisut.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071dcf3a5170---varemeletusavejesiwera.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f198b5b855---pomamojuzonafirekikop.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/magisalevajogosuru.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/71946efabb79c870f2109bc130cd98d9/fubukirizirodiletawaxu.pdfIn PDF document text
    • https://inncredel.com/uploads/nosog.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/12981155064.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76ece90a8---83601587804.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de61ae40580---43082744527.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/xorivowixanodu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f313e30f---96234932455.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/kugiwizuf.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/xiruwezop.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/5611840574.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3069344d12bc2ea502609681600a3323/88365602355.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/67312615620.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/xarobetulafowufijawetos.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d8be3057---razozajesunuwutukal.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b378c7ac88---nojipedejijuzulexo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/136b2cb7e1797e2b911b6ff86b670f71/xakojewigovemi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608307682d95f---nasekufi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/cl10jf99qrr6hmh26mt5gr0ka2/lufikewuxaperojaxezit.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/wuforozadapopofasiwa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdb4cdd6d9---67182030323.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609254a1a8d61---biraripiwoxotudizojed.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00018a07.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18A07 21132 bytes
SHA-256: 1ae0ce0c88aa094f5f51224d8ef4763f2bfb68573f638380f52db6d28802c43e
font_00_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 19408 bytes
SHA-256: b667ffc192fedf0c393082192ef30cc2f0252ac262a61b88026032b0ef72dbff
font_01_sfnt_off00012dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 10764 bytes
SHA-256: 1643954568b9c7bad899e40bbe102b3f0fae3df4e437cd57785ae51d2aaa0143
font_02_sfnt_off00015000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15000 11648 bytes
SHA-256: e169282448f7893e907caf48e9bc4df5b9c1c2280628db5fe9eacaa8bdf1ab9b
font_03_sfnt_off00016b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B0D 920 bytes
SHA-256: c22c4d7ac117fa5f2e644b4245cc9fbc52f6b373e0ccfc5e07f81b6a9d77acdf
font_04_sfnt_off000171f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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