Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6277e588d6b65c…

MALICIOUS

PDF

96.4 KB Created: 2021-08-21 07:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 112edbc9f7973da5ec45417050974267 SHA-1: 26a149988e2908ff3661d903dd2bb577554d6803 SHA-256: bf6277e588d6b65c9fcdb57c40455e6cb629dc4057af27bef3c0c5256495d7c8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a 'Callback phishing phone lure' heuristic further indicates a social engineering attempt. While no scripts were directly extracted, the overall structure and heuristics point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://marblobaths.com/app/webroot/img/files/18084232454.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b1858qv85940norkrsrvq3k071/lidesaniguwiloga.pdf
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/jaxagi.pdf
    • http://ingfrimale.com/userfiles/files/nevawufetisuxet.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ea4302fefb681e3808fe7c5240ba4db1/87472105207.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/jalulunelumigixa.pdf
    • http://karate-talence.com/newsite/userfiles/files/31045953213.pdf
    • http://kamnitikamini.si/upload/files/genorofipipuzememi.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8742270700---zamine.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7109d166b1027738f4b1c8a409c4af4a/64112620253.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/98827404377.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/19437545738.pdf
    • https://betenagro.com/sites/default/files/file/selokirajumupoditiz.pdf
    • http://renovator.cz/files/file/tijadutojetarowe.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e7bbf6223d5b7fd54affac836fddbf5b/jabinadikikesubugulojaj.pdf
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/44147070960.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b24204029---xebifezugojipivig.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/oefv48tvks4b4flfafmv983l3p/95178894877.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/wejetitudajimomikikepeg.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad8ce9c66---papanosu.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608226a00cbdb---25916326989.pdf
    • http://tokyoracing.hu/userfiles/file/85327636961.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/c4f20sl9bcqktclffpig2d1cco/babuzakivaxexut.pdf
    • https://aterhesseg.com/up_image/file/vafoxire.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/bajilowifudirizajodonur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+pe+apk+download+v1.16.4.2+free+softonic
    • 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_off000112b6.bin
2ff88e2b6de63903f5ae1b3be6428f7425065b4fc05c6f233ae8d7e03d4b6893
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 17004 bytes
font_01_sfnt_off00013f1c.bin
48be3a9ddd8ad04f72256d030bf826aac93a61974815e6b22f96bfca5d34d8cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 11336 bytes
font_02_sfnt_off00015a18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A18 16792 bytes