Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa2a2f9e8b54769…

MALICIOUS

PDF

83.7 KB Created: 2021-08-21 07:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 002d777733cb414185cffe2e79777aac SHA-1: 3e58639696ee0069e874ae10d6697dbcff5bf997 SHA-256: 4fa2a2f9e8b5476906289374f27ac41cb12c72fc305b551c7fc897d4f9cd5975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=adobe+photoshop+elements+15+for+mac+free+download+full+version
    • https://perfecthospital.org/FCKeditor/file/34969148696.pdf
    • https://gastriklandsbf.se/UserFiles/files/kuvajovufosinidomuk.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c7ffaa0ef---5366025543.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608aaee67abc0---tagakapepurozutagiw.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/1t5vq35d886mk8l5uq95ettj9v/17632784725.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f25cfebdba34976d22320f75d2cd82a7/wixidojotebotimutakuzew.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/72f982387dc0d4be27cbbf988cb339da/1243451033.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/towijom.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/be2a6f743a8dd5aba2c80efbe6a5b52a/kelaxabojewubarivexakiduv.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16117f7751f11c---41332532288.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/81b2d408e8a4f534fec43ad1bdef108a/lavudepi.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f52bb2fa---kemefebezugubip.pdf
    • http://myucmas.com/userfiles/file/87659294411.pdf
    • http://karate-talence.com/newsite/userfiles/files/xezorobedewajafojajama.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/86330d5d992d7b21069c34e2d074a7c9/36459346157.pdf
    • https://travelworld.ro/userfiles/file/33462698104.pdf
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/84508072941.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9badd3c4fc---43197031697.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c87b66aed---wufetiwijefomoseb.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1d57be487adf5c14421624514728946d/lukifubagubitenonaminozor.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b20ee36d3---punaxol.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66bb94b2e---ritirebedevexularuxuta.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_off0000e205.bin
4ee7fb3bf71728fa25ac23946ecacb88d889098f0015effd3b2deac90a478a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 16548 bytes
font_01_sfnt_off00010cd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 16792 bytes
font_02_sfnt_off000124e8.bin
b90da467d44726d72fe3dc944170733f13790415f0a5904b1c3d072e07707326
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 11444 bytes