Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b8fb80a640f105…

MALICIOUS

PDF

88.6 KB Created: 2021-07-05 20:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15f96391a1a1c540b36bc3e87be6f237 SHA-1: b1cfd774c242cd555eae01e09ae0d3644799cbbc SHA-256: b7b8fb80a640f10508d394704cd01fcc542bdb1a7b33c25cf537101e1573db02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.darvidproperty.com/news/file/tinotinuz.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f778756eb---rixiradase.pdf
    • http://consol.hu/images/uploadedimages/file/wibizizabisotuwapora.pdf
    • http://www.irrv.org/uploads/files/79341176568.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1e164b05---14332380330.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bbeee6ae929095a7e264d7bfb6ecf014/64097614676.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160767f32b495f---lipitufigavewi.pdf
    • https://kopari.hu/files/file/jepinafatenuzumafozamefiz.pdf
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/81998743716.pdf
    • http://alexlunacoach.com/img/editor/file/80148101348.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dbdb5b1e5---duwili.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6cd8503b3f7680569b936718a0784e93/98816654937.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec326cec6a---79064865097.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/31b994beeb7fa71c26a4e23368d833eb/68415735527.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7368iahbjsrdrp2e7f9d3ltotm/46450373114.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3d4ee7274---46273401909.pdf
    • http://promocode.lu/userfiles/files/77601357466.pdf
    • http://tugrabilgisayar.net/resimler/files/85261358010.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce45612b5e---wasumesin.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d65360d0eb6---21567041451.pdf
    • http://sotel-perm.ru/site/file/14735841824.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb160bdfcf---vunudubopeseneti.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087292681bda---23696861459.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/142c7b2392787d71130ef6451864a562/wubomukekonudatifile.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=scientific+method+fill+in+the+blank+worksheet+answers
    • 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_off0000f47b.bin
c9a147cf47938817f919fa441ef565c189a1f2d82182ac2f1881fe5def6c1ca1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 11136 bytes
font_01_sfnt_off00010e4e.bin
e44341c33d1a7c6b684be433780861c1a8be53c81753757e787768c1b99299c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 17048 bytes
font_02_sfnt_off00013a9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9D 16792 bytes