Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8af3cd86c03aee…

MALICIOUS

PDF

93.7 KB Created: 2021-07-06 09:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cbdafcfd827539f671982ab4edb3a8f5 SHA-1: c0ed32a0a763d057f7f8af80bf21bf7597cfc6d6 SHA-256: 5e8af3cd86c03aee2f10100668b8ed5e316551d304f042a722aa24b1b416c16f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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 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://bettyloupaints.com/userfiles/files/11047951974.pdf In PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160919f9b054ab---kenakowopulopigozukimiku.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210629030507.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/43412467310.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608142bdcd823---pelav.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/rogofajazekokusadebixobu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bc0266159492d3944128426cda651a98/lodonutiwine.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45606818878.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/bigevinizupaj.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/14221365842.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/xemutemapot.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/acd9fc79d8f04e229ca900cc3b6903e0/58108220686.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/tasafifojozugede.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c22137de4---xazozupawuroxitimepex.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/mofale.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/vogerotapupofe.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/19674076388.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/94113266187.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec0a23774---38080565526.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e7af9e7007201f8eecc868057cbec990/livugududavizitumudam.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/85465038675.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210605_053115_1475.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/36038353783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+1+apkPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001403b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1403B 23576 bytes
SHA-256: 108012dd8bb5138aa23cf17399187cb9b76076080ed9375a8e7bfad99d03ec71
font_00_sfnt_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 19136 bytes
SHA-256: 15d9a13df3b5ceeb842616b04659dbc52d899cc5fddd0e9c7d83319d843ebdff
font_01_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 10068 bytes
SHA-256: 1b4638190a4bf3e4cc6c9f36328fe367e29762e6ee209ade77c6e3df7a317e52

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