Malicious PDF — malware analysis report

Static analysis result for SHA-256 af19d145bf9ac800…

MALICIOUS

PDF

92.0 KB Created: 2021-09-05 17:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 468874d32a61ac89519a13c3c2b4dd89 SHA-1: 1dbd642f2b97c7400fa3ae0fa4a3aab7f12a5bfb SHA-256: af19d145bf9ac800e580054a8e71b28fe6fb8b1e3989e68f9e4e552b4a82cb06
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cba8edf95---fanotekonibulopukamere.pdf In PDF document text
    • http://chiaranannini.com/userfiles/files/dadoxapatogeli.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ac23aec0de565a3df05820d9904a988a/tevasogevisewirizevor.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/xilom.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1cda1ca8d72a305ee8482c74ec36fe1c/34805502634.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/42384685838.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/52824589507.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/91625711548.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/de76ef9b760ee71c99825e9e09032399/72950967717.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/vudusuko.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b07f81700e0---nosorek.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d92da0d50---60775862714.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f239e423e19c50f35384e5e548defd4d/ripunogorudunopijev.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/xemujojepekupuz.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/11510929697.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7670b4855f---20089461122.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/lowowawowisonafudojaf.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/takovunalusesapadurumide.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/cau05pgdd4t0p5uehqk03bsu24/jekijunibeziworamuki.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///jikasegipikoliwege.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/56608546637.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb472ca33c---toxipefesegerulukopuse.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/203b94979c518e16f13553579b736b9a/sinud.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/gotigesememifaripadunaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=boy+meets+girl+harris+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 18488 bytes
SHA-256: 40c201e2bb1599fa9b92742bff037b8a6f3c130edfe8499a48e099c40c8a4aa5
font_01_sfnt_off0001312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14942 11008 bytes
SHA-256: 838ae44a36bf56c237bc7926bb3f815aabbe633ec760c8b22966f803637ec648