Malicious PDF — malware analysis report

Static analysis result for SHA-256 4562767d940902fd…

MALICIOUS

PDF

87.7 KB Created: 2021-08-14 21:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ef4c4970574a65c25a5f3b68a1f628a SHA-1: a9c8f06f4b0b3ebb5ddb562d296cc9233d1e3e28 SHA-256: 4562767d940902fd2fde95848012e27e8b456baf1d08905afd2b73fb7e263a73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and compromised hosting suggests an attempt to leverage these resources for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://zs-oilfieldequip.ru/d/files/7938845083.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16117989eb203d---8410110054.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/duruwodureziwoxazimafid.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/vebifisebizalo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae4d2db8b---sesarilis.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089355723c12---87209398430.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f3f82883---vebanajafuxafez.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/304088edb55a75433af8267afdef646b/29013153103.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/60213868050.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0eho37j23mq24vpkfo0ruu9571/rodokowepefigefakuzopoli.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/kelasiposafokokavugalivu.pdfIn PDF document text
    • http://momsystem.ru/public/file/57699676608.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7e42c74ecdcd78bf542ce4db7f1319c7/kamozidilomeviwitob.pdfIn PDF document text
    • https://mvservice.it/file/10097653191.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/pagutomalufinepanov.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/fogubedin.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/vuzewukitoxib.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/jugokapedobekeperosusag.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xubiwivazevuxo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16109028247406---lisajekinilo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/69iv600d2vem91m56ulqm6clt4/mojuwowoxofovi.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/865271674.pdfIn PDF document text
    • http://totoumi.jp/upload/file/wodipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=call+of+cthulhu+weapons+pdfPDF link annotation
    • 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_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 10740 bytes
SHA-256: 20129ca6429884cb537fc9210e06133a350da62d3462cb8cacaa93164199b767
font_01_sfnt_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 17428 bytes
SHA-256: a57580a24c063d0bde9248b34c8c8def821f6f659390873b96319212615a331a
font_02_sfnt_off00013864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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