Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19367851f9df5b7…

MALICIOUS

PDF

94.2 KB Created: 2021-08-21 11:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7625f01a0ba406f88ba5334acd1f81cc SHA-1: 2706ad7649d10b2868c667220bf20aec4ae60c29 SHA-256: b19367851f9df5b7283c3357e9090268deb51592f63f648c3f2bb623af6a0a3a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, consistent with a link farm attack pattern. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://benedictinoselrosal.org/ckfinder/userfiles/files/63432282545.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f428b4a7---94350088996.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/82935449224.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e94beb5c9---rowumaduzeg.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/81516021423.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf097d8e6---zeliwatij.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/dulerodojixadik.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/lisixi.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/56188388142.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/26977966594.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fewasiwuk.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/daa25fc53caed832c414bc3dc64426c4/xovepisopojux.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d57c482b---31002416915.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/sejeluxuveruzajeraxov.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/redekufivedatabuzesetopet.pdfIn PDF document text
    • https://t2sc.me/userfiles/14995972415.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0ef360a148f49af16ab63ca4d21b4d84/nolegikoguveduv.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vedajijutixasedujilefu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/n4bkvpj6dr8bjtbj3dj0sq3u15/37154866033.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a3ad29b7f48998abaaa431ed7fe8e5df/zaponekisenekatagivobeze.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/34e2474a927b8ec87a95087dccee7849/63187291776.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcbc64ff30---88062522712.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/83653874199.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/525382a3613d33a2d3f71ef7bffe6995/fefedewogidokudigisapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bissell+powersteamer+powerbrush+not+spraying+waterPDF link annotation
    • 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
font_00_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 11192 bytes
SHA-256: 603a1366a80ee8a16a816e40f35759c95cdeaafd1bab6ec31a7763c7b68b0b5c
font_01_sfnt_off000116c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 16816 bytes
SHA-256: 07df2a8c7fc697f756f23dc9a0febcace37d409ec7c6974b421b116e330c5961
font_02_sfnt_off00014281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14281 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off000157c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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