Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ad6b568745ad16…

MALICIOUS

PDF

114.5 KB Created: 2021-07-22 01:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e929a9003c3cd5638cdd4e7b7ea4236 SHA-1: 3714fa0ce55578263b218d22949168d773b9518f SHA-256: 48ad6b568745ad16e4087b0dd7e83423475973972af8ba50caf6825de7d703f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, serving other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS uploads suggests an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://85097781.com/upload/files/pimafirani.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0ab6f48b---79184440014.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ff07420a3b994dc534c1221f3d869683/gitudigifom.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082425ccd1bd---7088550256.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b120bcb5bbb---4387682594.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/740c72673bf6441958be5690ffae1df8/2128602747.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c542b421a---32097796117.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56d2225ef---2849687288.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68d44dbe2---74577328576.pdf
    • http://divorcefinance.nl/uploads//file/zepetuvilejozepiv.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/fobigif.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/78a376bd1f035dde181d66e373e6abb1/bixutorekufumiki.pdf
    • http://scandirent-new.ru/uploads/assets/file/xuzexuxebaj.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/a66nhqbf7vsts6ajbcegf9l3du/pinunawakokiwes.pdf
    • http://fixafilm.se/userfiles/file/86610673112.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f58100e76---lemakunip.pdf
    • http://arch-teh.com/pic/userfile/gekexonadogixibijefixi.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/68f7658a1edd13d27c0115ded19bfa42/kadomif.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02635eea4---fidofozalipivezerenokozed.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/901c1863d998c7ead1bdb23a259351b6/30668781752.pdf
    • http://diamondsnspurs.com/clients/12200/File/kexamibusez.pdf
    • http://novichiha.ru/pic/file/58081926868.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b2ea8054---bedibudunezexaxenaru.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/20705652621.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=prayer+for+deliverance+from+jail
    • 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_off00015f8c.bin
1e9c90c3cc6b56dadac10ea89be6949aa5698215c11ae3e35e15d1e7099bc197
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8C 10680 bytes
font_01_sfnt_off000177f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x177F1 16792 bytes
font_02_sfnt_off00019003.bin
6c3f76f0f5b63d2750d755287097d49a7d2d684419bc435567642602e4881fc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x19003 16692 bytes