Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f0802f94f5e9c3…

MALICIOUS

PDF

63.0 KB Created: 2021-05-10 19:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d411dcfae816d7be9640da5f4b675fe4 SHA-1: 345abc51df0decdceaba1d694520f74dc7f17f6d SHA-256: f4f0802f94f5e9c331f6263928b996e301e107a60962b112c04decc3538b2291
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to distribute phishing content or malware. The presence of external URIs and link farms suggests an attempt to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=letter+m+coloring+sheets+printable
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ac3997c0---60787695977.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7da4ec87---71226163855.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16072ceda7fa3e---76601595233.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/n292em43qtkn1fs00tmca7isli/28358555131.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f7b5f58fe50822da0b9d7331b3ae57d7/88659913200.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d4fe51079---17320472135.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6c631d09cdddde543a33441e8db2500c/zifarijokedubuw.pdf
    • http://sosnovgeo.ru/userfiles/file/muresajabisepugo.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609473c2eb272---32051854969.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/421bdee7281a561a994bbc27ae8566c1/pixexebodetikutitux.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5478f0f3f---boraler.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a5ea8fd1f33b26155d42f776118021a1/94167598863.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b797ddfa2469d37a1a25a4fb444e8080/xirijalilenuruzalamen.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14a7934e8---gavudoka.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/pezadawujubepowe.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4c778743afd648b306dc93c5897a54c4/85170044369.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d55c2a2f40c00f9e275b5e1553ac97ec/zodutinupuviwijaxusabiga.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607154825527e---35676784236.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfee.bin
19a6348185e8b564de68352a77857b24d8d84e8e544c94a94aa8f2a9acdc5ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 5216 bytes

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