Malicious PDF — malware analysis report

Static analysis result for SHA-256 409659f716e474c3…

MALICIOUS

PDF

88.9 KB Created: 2021-07-24 08:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e04c3a197d47eb271905e47bb7ba17a4 SHA-1: 16cdeaa7f6645ff2f6da91cddf2f20bdfd13035d SHA-256: 409659f716e474c3fbf412d57024bbb4d86bc346ef3be4f563678bb31edbc73c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 http://shophouse.info/images/files/3443401050.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c264eb34---gitopanubogotaguzukesem.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/48512034854.pdf
    • https://hgb.se/filer/file/nukusaton.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12600d5865---59214809699.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd5a7990ef---pemafijasojusamat.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8m0fimoc3ot77dttum52rp28l2/gadotodogitarowo.pdf
    • http://shimoltd.ru/images/file/litenu.pdf
    • http://dobrasekacka.cz/userfiles/file/lifepugefuj.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe1ed3407---povepigasujawuzozuluse.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1b16816351af0ea487850cf97c851efa/demof.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/t0bp24cbafcn2ia906kgs1j444/vibap.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bamitu.pdf
    • http://shukokai-voves.fr/userfiles/file/5315787160.pdf
    • http://4bx.pl/public/file/27164507557.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/botezaju.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/50f6c53f13846e8d7143874c16b168f4/82495655066.pdf
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/43376471964.pdf
    • https://stopserv.ru/files/file/97041030388.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/a7cap1fc1q0us6vmmfscbl1ht2/terila.pdf
    • http://timnhanhonline.com/upload/files/79734215262.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609139b23022c---balupuze.pdf
    • http://orsini-blasioli.it/userfiles/files/dekikep.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/97f6ac4f99efb95eab5b8981cb585b8c/88936126414.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d21957fb3d817657c81933d9fac4a3e2/rotefuvamasezopunide.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc7627d46---fonib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=replacement+parts+for+dash+compact+air+fryer
    • 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_off0000f64a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 16792 bytes
font_01_sfnt_off00010e5c.bin
d639cab328d910aecd292bc6ce8aef5bcd943fcd0f5d764afc1b004dae08b8f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 17096 bytes
font_02_sfnt_off00013ae2.bin
da3759136639017c0d2670335334bcfc1bb64f3ddb2ce0af90b580e590f5bfe6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE2 11044 bytes