Malicious PDF — malware analysis report

Static analysis result for SHA-256 864523a831cded42…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 17:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3bc9732891664e8f7d2fdd2970cf0be SHA-1: e13d23b0d95f48e4382156a90b4b869ce5c7593e SHA-256: 864523a831cded423ae535af2088d2dfcc38805ce91f09aceff3e709a46ec9de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

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://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/81303341746.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ueajbghpo32cjam3plvc3cue2q/gaguwemipi.pdf
    • http://donauwell.at/userfiles/file/5246061056.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a5a9b29ca410a8f92a8587ee67623acd/datufagegemozudowovusa.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/dexiwowemasolafikoromu.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3a64c262---67599157795.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4417e083---jibalokesofusopawe.pdf
    • http://extracam.es/app/webroot/arxius/file/nowafep.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f3e0ccf4b---muvezodezunijagufake.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e248859ff9e78658de2d9b1f1800d367/fibisuwipuriz.pdf
    • http://studiotecnicobonoli.com/userfiles/files/2260292899.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/99163567477.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/878ba0bf0ff6d6e5198c87ff3167fe68/78505425858.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700088112e5---40979495670.pdf
    • https://canionglobal.com/FCKeditor/file/bijakuwopaledu.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5e21f01bb57c4a999d99bbc137bcb478/witedofokaribapewafom.pdf
    • http://szrealty.net/uploadpic/2021-5/file/2021052507010973499.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e890c34b---62221462830.pdf
    • http://teknis.it/userfiles/files/15741736498.pdf
    • http://cn-noah.com/uploadfile/file/38968130469.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/59254bf8f46effbda287fcd9abbbb818/64733024155.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1c921ac08---98475065911.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/41371918292.pdf
    • http://rotarylaspalmas.orgdocumentos/file/wiginuzo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+value+of+spring+constant
    • 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_off0000ff16.bin
eabde0d19a84c310bfd272ba3b35f42604d91f40977603910d54ec3c9cf7fbc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 17252 bytes
font_01_sfnt_off00012c9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9B 16792 bytes
font_02_sfnt_off000144b2.bin
7679f1e01003445375645fe78d41c1cf070801ac892e0495d68ee0c356723088
pdf-font-stream PDF embedded font (sfnt) at offset 0x144B2 10916 bytes