Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a806d72cba66e6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 16:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cd019afb31a02197dc160bbe9322dca SHA-1: 1fdd9fd96a0c34c7888744e9074a3340b463d653 SHA-256: 94a806d72cba66e6c64b695802bc86b939fbce4fc2517b7b60861c28e5d0f63b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=esic+result+2019+pdf PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3ac3dc61---60970080682.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/3a485g9cn1t2t8fbm0g6tschn1/xedutolixalidi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094585384be5---fizeradetawozalojon.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160791741d7efd---wotejoxiwogoxofevepukezam.pdfIn PDF document text
    • https://pindimana.in/uploads/file/vadonamujoseritewe.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/55208106819.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/68af024c4a9d7d6fec0db06897ed85dc/diwatigomixovifa.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/kimumenewupamolapubeb.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xefajo.pdfIn PDF document text
    • http://yjccnc.com/upload/files/93873968187.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/10127297412.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/silofe.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e4a76acb---wizusebuxutivigixosux.pdfIn PDF document text
    • http://clingac.es/d/files/52151554149.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9a5e804f---lapoxedolu.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/juzobanapagipelawexazaz.pdfIn PDF document text
    • https://botroul.be/uploads/potakavom.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17957791422.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16259082011179.pdfIn PDF document text
    • https://bem-sa.com/img/file/15794760129.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/72710660401.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/5404959147.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be2eb59d7ec---rebomope.pdfIn PDF document text
    • http://519pf.com/userfiles/files/mekikojiguko.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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 17616 bytes
SHA-256: a0ffdcdd50ac6796bcc07b2b4baf818b76e1c0ea5bcf9c92c07d9d36172d0d04
font_01_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 10772 bytes
SHA-256: fbe2baeef9616410c724b6a1255d25a64276151dd32e9592d6b97ddb6cf47914
font_02_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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