Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d4ff9f2dcf317f…

MALICIOUS

PDF

77.0 KB Created: 2021-05-20 12:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7e6c6bff64cc277ecadf34b6417870c3 SHA-1: 2b2f35f79a204868e217828f8e51bfa9dbf82160 SHA-256: 73d4ff9f2dcf317f436658caa46a845e32723575a9ef8fc740a46462df4d9efc
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The document body, though heavily obfuscated, appears to be a lure related to "Frankenstein" to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 https://pixomot.ru/uplcv?utm_term=frankenstein+by+mary+shelley+plot+summary PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/41d8679fb5a5dfaee4cf258588659cfb/sekedawururopapodavoloj.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f6248626b1f64c869c741fd3f6186dbd/48326142891.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5eb8c37362cb4586bdae46b0d717fe1a/damufisigij.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/t351974lp7hv0i1ltsqfuvv58u/8463411250.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/26105467436.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7lubmlnc2gfigj0a56mg9htpv0/nodilatilidu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23297eca43---94065181450.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4hvkadoj1899auoiuevg746ot2/68134669216.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb74e47de3---47174597404.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607713103f872---33745503338.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/pazenamogow.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/tivipofala.pdfIn PDF document text
    • http://capital96.com/userfiles/file/xetepajetasubonazuru.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f204ea53---58554837488.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b7vk1oc33v70452osomu4ff2uj/xifirujumifaxupafegadet.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/zovemazoxeduviluj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 5320 bytes
SHA-256: 794dc1b81e43d3262eac7ea92d7f43a3edf1fc7a8b8d556fabf7abfefd21ef58
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 10240 bytes
SHA-256: 957504a5b076cd8f92fdeb9394a06bef427e184018c444aa1fb41a17b0aadfa4