Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb412929af2f3c7…

MALICIOUS

PDF

88.0 KB Created: 2021-08-10 21:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8a6304c86b1d10056f40dc893339eee6 SHA-1: 86a001666a60838a141257fd8f314677017c4f9a SHA-256: afb412929af2f3c7203dbf202940124ab5907e1969adc38c5c706e4251a128dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=can+cleansing+your+liver+help+you+lose+weight PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba3fdcb67e---49460762417.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/2364758401.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609981099e3d8---jufelevafopezasuteturapav.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/pemipezajajoxulukusikuri.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/81590624173.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/3331582283.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/lisonoluw.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/44979131069.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/84822625123.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/taxemerobotitaboleju.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2905dcdd0a---nebuselizifujalekup.pdfIn PDF document text
    • http://gabortech.com/admin/file/78548616951.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4875033f5e25a741aa1024965a33e58a/55572050002.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6c0a0a9e88e98a2596b596221bcd4dce/vigevevok.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/54647536948.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/girike.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/fovebujiduweni.pdfIn PDF document text
    • http://grotech.in/userfiles/file/36687935338.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec9973232---feratoxawe.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/tosukakejolovuxuputuvut.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/m29dp6i4k3jatcrt0so7f54s47/lavujijuruguruzajub.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/24665930010.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fe66bf39---39067177769.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_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 17524 bytes
SHA-256: 254d46da9cfd65c19b9c30f6b850c1f0a1a40a2b49870556ef4401d2ecb6c73c
font_01_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 11052 bytes
SHA-256: 31f680f3a5af589c163dda46e9c67e02110967b850fd41f3e3eb08e74347407d
font_02_sfnt_off00013830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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