Malicious PDF — malware analysis report

Static analysis result for SHA-256 749b06a179db9412…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 12:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97e08a5ab9285ad2e66cf5b6621d9600 SHA-1: c6a1528d71a055447aac7150121431a701f50d17 SHA-256: 749b06a179db941201a80f086f746103c6958437fcc42f63284ac22117c7605b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=modern+roblox+bloxburg+house PDF link annotation
    • http://janjoling.com/public/ckfinder/userfiles/files/mibavasiwufevuta.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/98306355291.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/xodedadebub.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/29406272283.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/89976889608.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/89271049904.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/vinobi.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/94580082298.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa61e5990---11372999867.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/ropivoki.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/71431552216.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/foloxadezapilijev.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/pivof.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/62299749392.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/zovuxadosep.pdfIn PDF document text
    • http://unseretochter.com/images/file/68129586378.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/49028271258.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc01975f4---kegirotuzowakabuv.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/68941089730.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/sesategubuve.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/65445700543.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/sugudiwuwezinanenamofutuw.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/rularuxubupo.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/71622075973.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab0eb3156---38854713104.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/pubetejobabobu.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 10508 bytes
SHA-256: 868e235700e70f041a2e2bcbfa2c69e1db8bcd4b9d695c322c35b8e734d356aa
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 18236 bytes
SHA-256: 389c6594e4f01721b207cfba0b39e1a653cebec21bec5bc4c422c8ec00fb89e7
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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