Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb53d46358129c9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 06:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e36834177f2cc899b8895b29d481258 SHA-1: 07dc566920c85a1518bc071337e99c3c965c72a3 SHA-256: 5eb53d46358129c9125f4c57daaba644f6e3fe0015cccd8cc3c692ed736f3977
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, potentially hosting phishing content, and specifically as a callback phishing lure by prompting the user to call a phone number for a fake issue. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to deceive the user into initiating a fraudulent phone interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yasairamenbar.com/uploads/files/nifer.pdf In PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/53042715864.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/36812553161.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/2060873569.pdfIn PDF document text
    • https://baongochoa.com/upload/file/86079247517.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a5a98b75---59486954908.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f189b55af---89757040249.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/98119512082.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/nalemiziwofekasef.pdfIn PDF document text
    • http://technocom.pl/editor/file/18665515701.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/37856976788.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/31680927425.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/61268202115.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0197284001629721727.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4c7361a313dc2e72eace8ed0e57fafe3/tonirejugigomagase.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/63944585233.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/12336757743.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/gujen.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/konoxugimijuwefogezivase.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c350cc26---tuvawile.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/fokusixulexukafaxubako.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/53016724505.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/nosebagapokawiguforakesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=taboo+cards+easy+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/rivetoduna.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 10492 bytes
SHA-256: 7fd3563d9332c4d37a6a55b4dd777c87953762102eb863e7cf81b4fc5bcccdf7
font_01_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 17772 bytes
SHA-256: ca9e8771a861406c63eadf2ec9043bc8691bac3aaf41fb75c61ba51316232972
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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