Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c785318979345a…

MALICIOUS

PDF

87.8 KB Created: 2021-07-21 02:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08af209ad8857d96db9eb6bc2fe961cd SHA-1: 52ff8ad0b2f86a32c3e6b2ea9350d58817463b38 SHA-256: 31c785318979345a845378df276698c5c4ed05a199482fbe12ed9987013fb4a7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, is generated by wkhtmltopdf, indicating it's likely a crafted lure rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.florentmaussion.net/userfiles/File/rodifebego.pdf
    • http://canvangdientu.com/images/file/bebekubefu.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/13a2ac66b8669743b35e2cfed3e2145b/lodeniwatexidenize.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec0a99cd1---nowaxuvetizukawawo.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/70046614250.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9c6ec5fa440252c2aed0bbc4788ee6e9/fuwimifebewubep.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57c96c3f5---1644999720.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/77344076603.pdf
    • http://studioboscono.it/userfiles/files/13260635873.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/wevitugovogipufoxaxovatil.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/60118980273.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0556a4be---valitolujab.pdf
    • http://avision-italia.com/userfiles/files/godesakapekisegex.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6c0888c7df5dfe16407986cc472a0eda/watenozibofazefebi.pdf
    • http://afghansolar.com/userfiles/file/pelegufuruperonino.pdf
    • http://mulroyenvironmental.ie/userfiles/file/19661981785.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a20a4e54---todifur.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089d79321bf2---39717726116.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6d2b9fed234c1141be990c82059c6b17/zabumekugoxuguvele.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/inpn3m9f4cr6hiear2553orbr6/rufigukikudifulinuxunefe.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/81502044356.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ic7evde3fkv4t2p0jndn1n9gl1/37089897984.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ablu23h0ms5nb6h0m5s66l45pf/josinubo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=project+report+on+poultry+farming+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_off0000f20d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 16792 bytes
font_01_sfnt_off00010a1f.bin
821b3476f4ba489d48a5db2dbc281ca4751db88990bef8e638f69f777b775451
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17612 bytes
font_02_sfnt_off00013840.bin
bc729c6eda26f4b198b5bf2277ac09eb46f1512a0bb21697545aa8d0bbaba389
pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 11140 bytes