Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc5adbb1c226579…

MALICIOUS

PDF

86.6 KB Created: 2021-07-05 12:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dc17c732c4301be7aa1274783a8cdfa SHA-1: 6bc7a0f2d0822dfa2f8ac36875039dc09f0c11e0 SHA-256: 3fc5adbb1c226579e47a37362e72ee3bf97c47c227f253557dc588a512653717
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, likely to lure users to phishing or malware distribution sites. The PDF structure and embedded links are consistent with a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://digemnd.com/UserFiles/file/18627451094.pdf
    • http://steakclubhn.com/campannas/file/70473767392.pdf
    • http://bearings-home.com/userfiles/file/80745720533.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc84b29585---jajagigomovedonuzuje.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b336707a891ad3398b8015440e2bbd54/12684112722.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160de64969cba6---43709648799.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2ehjh8cdq813va6s2r36lm2qvd/gixuzoretave.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/43h0l4i3dj1rfpngf5j9fdo8bh/18263620546.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b52c7bf1c35ebe6188cc5eb904d2a3e2/73717865046.pdf
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/vadofotolatabum.pdf
    • http://abarappresentanze.it/userfiles/files/73245529793.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2263294a38e8798dedf2a9f66eb459b/lutuxikawowarefedodekesax.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9a5d35c50---2970230355.pdf
    • http://poetische-malerei.de/web/editor/files/moduwom.pdf
    • http://softwarefactory.nl/images/file/86531851026.pdf
    • https://preprodpcb.com/userfiles/files/33349365581.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dee232cd9---22027831898.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b818e14a6aafb8fddef36a195c5be58f/4439446564.pdf
    • https://cengilli.com/icerik_images/file/sojezuni.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602011232.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/56f8ca728df4be45e06b2dbed2664708/57468119658.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/35rrkvvglhs5ehaa6s57c5hij6/dujekibupesuma.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c7646300b---97406183866.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/48b163dc247e15d932499244f1eb1730/xilizuki.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0a045f8ce6a6f1a9cb7be3f8f593516d/tavesadijuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=working+age+population
    • 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_off0000f247.bin
7e3b6f5072f8cb69f0f845dba95b96e4ad67b4b7e922a19fb65c6860d2929afb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 10444 bytes
font_01_sfnt_off00010a18.bin
d2f200099b6e196cbb3d56cdff65d5a22b9de1f31b9f650ddbe0fff73d443994
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 16656 bytes
font_02_sfnt_off00013516.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13516 16792 bytes