Malicious PDF — malware analysis report

Static analysis result for SHA-256 f056e5ea91a97818…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 16:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20e733a5f3915e224d63415a899edd8f SHA-1: 8f4595853ba9ca9c38456c6fbd40d4d2c45aa39c SHA-256: f056e5ea91a97818fe8787cd439a7c0af13f28827eee7ffb7a283023bb79dd6c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to trick users into visiting malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://garglob.ru/uplcv?utm_term=whatsapp+messenger+apk+download+for+pc
    • http://vietnam-intraco.com/webroot/img/files/303540984.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/38106900402.pdf
    • https://muzpony.de/obrazki/file/14977538667.pdf
    • http://formpart.com/upload/ckfinder/files/51582882100.pdf
    • http://onlinetradeshow.ir/uploads/files/25606500791.pdf
    • http://myucpb.net/userfiles/file/54604633978.pdf
    • https://toolsatool.com/userfiles/files/bedonomemitijopirubutok.pdf
    • https://ilonew.tasksplan.com/userfiles/files/kaximuja.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/da09cf001623c53c08e15bbc1afa450e/vogazerinef.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369cab98590---26279241775.pdf
    • http://sinice-rasy.cz/files/file/97777998820.pdf
    • https://winpoasia.com/ckfinder/userfiles/files/74713353465.pdf
    • http://tries.cz/media/images/upload/file/mamegavolidabulur.pdf
    • http://pozitron-s.ru/userfiles/file/kunuwegutisikerifid.pdf
    • http://boekenwinkelindex.nl/images/uploads/71618488567.pdf
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/pojinolajomukenoluxazude.pdf
    • https://sayurmateng.com/contents/files/38895401383.pdf
    • https://greenfins-thailand.org/uploads/file/gutaxewid.pdf
    • http://agecarekorea.com/ckupload/files/beboxoduwuwegovosodin.pdf
    • http://scvumaichiramen.com/uploads/files/lokosizozov.pdf
    • http://upnbkk.com/file_media/file_image/file/malumiwezitefise.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f249bba9e---ladosogafezozawavejefoxu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613769a5dc3a0---gigupedubelefagimuna.pdf
    • http://heninrealty.com/userfiles/files/polefepuviv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bda2.bin
26d85e0eb094d23ef833cd48539cf0a6cfa6beaa90fe7d2a3f4f17b08a25b589
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA2 11148 bytes
font_01_sfnt_off0000d762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 16792 bytes
font_02_sfnt_off0000ef74.bin
aa9c45866750bf5c3c92ef53cd9f2001d8d96dc084daeb49767e027fc2b394b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 15596 bytes