Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8af6cfbaaab3027…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 21:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15cd298d3006398c229af3be7fe03fec SHA-1: cda1f09d41d1e85c5ba2fb6c1c2714d9b55bd090 SHA-256: c8af6cfbaaab30272b54fa9b34baa228ace51734cdb12ccfdd94f39dc367a775
176 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'callback phishing phone lure' heuristic further supports a scam-like pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/df6ms1cpp27qkldbeps4bd4t0m/88018940515.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1e59fc24---45137884623.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/zajasiwaxo.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/28584646774.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jejakefefolokega.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/93370770486.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/lugibiwadutiro.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/nemujuwisonifekazijutip.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4352fe652ab4c9d8a4be6dbfa55a0621/98453638077.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/88460006644.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/jte01okchusqtguj7f85ueabbe/45390238306.pdfIn PDF document text
    • http://bg104558.agchost.com/userfiles/files/99859199682.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/42032593978.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e706ccf1---fiwesoxomakexe.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/noxikafiziwuzix.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/riworugizofibifi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/436c34f9cbd8a8e5f533eef20c67b7d6/wonotufugoluji.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/lcsklvp7u1io112s9p8v2m0nj7/zomozaf.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083953c6b6b3---panegadine.pdfIn PDF document text
    • https://jotelek.hu/files/file/loguveriduwi.pdfIn PDF document text
    • http://wenxuezj.com/images/File/mimugejales.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/televezetiriz.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/58usqg24pfplt80pnobm3r4aq7/xilofatopifajupixajule.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1t3eev6jhrv1fu8uoih9vu3ovo/ginopegitilipinifeju.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fa3b55ad4---4484121879.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/43473383398.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/4lqck3moh4pbrr7cgiublqvqoi/21238620465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gaap+pdf+2018PDF 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_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 10172 bytes
SHA-256: e6137006f3263160f0f8e440032f7885408fc461bc6d19af311a5fbc631fcd42
font_01_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 18960 bytes
SHA-256: 404f8d422b1f85f6d9216c8ee7d89670485eb2587005c62b9a77bd5741f98a07
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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