Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04a3511caaa74af…

MALICIOUS

PDF

87.0 KB Created: 2021-07-08 00:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24f701f6fbce9ea21c2c0789c64daec2 SHA-1: a094745e70bbaf390cafdaacbabfb33ade06be0b SHA-256: a04a3511caaa74af84c12dbdf09db6c767affc376f6ada4e9e6a48b8aa801eef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=machine+to+copy+vcr+tapes+to+dvd
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5b931ffd---30906384098.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f6d4305e---xufavuvose.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/m7rrceqosq9mae9dub3qtpk1q1/ravowaganago.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf8da9784---10277842832.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c01c84ee355b6f8104bae45e769af170/vezikimewumagadaraw.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf8c3250b---deremuxujud.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b471ec55abe---bivogezopupoxura.pdf
    • https://brianhigbielaw.com/UserFiles/file/82370358203.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608551e4b776b---23344138611.pdf
    • http://livelyway.com/ckfinder/userfiles/files/50317031840.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c0be3ddcc10be646c0d594c71e3bc195/xanujeguviwolasemav.pdf
    • http://allycatering.com/userfiles/najozen.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5pn9kgs9kemjsopi78v4ckne4u/77026142794.pdf
    • http://bienbao.net/uploads/files/88386328581.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/gm0qk7o1a62fds83egbfmeu722/gewadefudo.pdf
    • http://iehyun.com/editorupload/file/74215783290.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/70369685200.pdf
    • http://onlineticketreview.com/images/file/3340188042.pdf
    • http://stattus.com/assets/file/raxibopo.pdf
    • http://retroldn.com/userfiles/file/63387459043.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6783ea4ae2---17550824074.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1b99b20cb---radarobububoxi.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b895340098ef6e6cc67d006b53af9396/98698105034.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_off0000ef86.bin
8ba8bbab06f04e5aa3d7397c552a4ab07c38ec9267fdca26c357c0d1a78ef4e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 10736 bytes
font_01_sfnt_off0001083c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 16792 bytes
font_02_sfnt_off0001204e.bin
940d061a80a1eb93779c2e9207949f6ab1fae45046e57a64f5188d759426282e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 17268 bytes