Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7657cfb4d9c5276…

MALICIOUS

PDF

94.3 KB Created: 2021-06-17 12:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 917ea7745b0150f93e07b3b3350bb7c7 SHA-1: 7893c24c26570ec0b9406d678e77b7b88c899eef SHA-256: f7657cfb4d9c5276c2d2088e2f068a13cfba714923bc8ba080d318aaa76ea7a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://queure.ru/uplcv?utm_term=new+total+english+starter+pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d2546f2f3---joralizujumasafigogo.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/75127a3d7fe6c3431348d80fe46cbed5/57861772942.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/dnd9ds83irr3e6mdqralumorl7/nowobidudokalarefin.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844a002e27---lejepirebaxogowavejosu.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249e0040a4---73230370263.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2fa5ebbe---wedekifowuve.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6cae5ffd3---72240519356.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/47440463629.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/murariwitid.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9af6bf430---tofexotikumobomofamumo.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f6305430d1ed0bbf047aff3ee3acf32b/58982937179.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/98caf6d9c10fade0dd1cd80355b07362/kezinitun.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160918f5065227---47387323275.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0d00vo8m99t5pkrekqifgiefdl/gatoturitave.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9f616e2e---pefadofagepixarufepu.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4a8c078590db13da6ea5a7be016f2e39/rorefodowe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off00011bf2.bin
5331ce767ff8d836882f109b4a6a335fc48cb18e3de8f302d0bdf383b568564a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 5364 bytes
font_01_sfnt_off00012e42.bin
ef60f8967436cf689c61a126fc7f63c2b4532c5e36a4f8e4b3422e4690423ec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 11144 bytes
font_02_sfnt_off00015420.bin
b9665bcba64098dbfad72decbe44fb4d8469709a63677bb5d7fcd8d4a1f4249d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15420 16876 bytes