Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2748709891ff6ec…

MALICIOUS

PDF

140.9 KB Created: 2021-06-10 11:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9776ce222b3a5d300c38b2342623847d SHA-1: 5f02cfa290df447fc9e13abc98c7d81ffd7f0eaa SHA-256: e2748709891ff6ecc8944578bb11db1ce53b421641c4a15ded2c6a5b5754d47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://laborke.ru/uplcv?utm_term=telugu+to+tamil+alphabets+pdf PDF link annotation
    • http://tribo.kz/userfiles/File/fezameketoxek.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3d8b813a8ec8c4d76ef20d505ba3402b/10506628907.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/jekazibipata.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b37863d2402---lorolipi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335cf4e33d---8101951396.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e86cead4220f048cb2828df8ce9d15a2/gaganobuniwolabof.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/belizitukofazelebigezid.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6e89b696bec3be4de0ecb4810b69093e/28651571274.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/db382aa2973c5a6b5b61c8a3708003f5/fijeterigiwufofetopisub.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/575bb1703f362be49b7069451e38e5ce/76371343682.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/57060692406.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/8536044409.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3a1bc8ff---dijogumuxibaxexefoziris.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/kupuzasebogijatovag.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/jugozuta.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/sepozakuleregefunapimunoj.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/92157718023.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000171ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x171FF 52440 bytes
SHA-256: 04f11252a60cbddeae22496d933726fbe0f9d1367ea28454c80f3b4c796f1d44
font_00_sfnt_off00015fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA4 5448 bytes
SHA-256: bd6b46a938cf1af966d963defa3ae74c577d4dca532efb0fdc6ab533be4b3525
font_02_sfnt_off0001cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDEE 17884 bytes
SHA-256: 192c2022cce787271350f0c7b7b2e3a70ea0cbde28426a41aed80eba5c8a82fd
font_03_sfnt_off0002023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2023A 16592 bytes
SHA-256: f2456ed23b225f2a8d524b04725d524b306b0a5a8385db56ab9f5225dd482486
font_04_sfnt_off0002194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2194C 2480 bytes
SHA-256: 9daf0a6ade508536ac8a68a62b74ea87460325245a3a0eace23fc8c458ed32b7

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