Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10daca1eb9fa4a0…

MALICIOUS

PDF

89.4 KB Created: 2021-08-04 10:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a86201de56ce96b7aed9b830f1b5d11 SHA-1: dd4855ff0b4a23de060a96a69eded689be153e29 SHA-256: f10daca1eb9fa4a072dd3e8e16ee0cbd9c61ad66f46b8d68ce1fa0a473a8f8df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable domains, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://patp1ryb.ru/media/file/84463476204.pdf In PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16259147955331.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d28658cc01---62476685929.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/70246523338.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd482df087---wagipakuwilofemir.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160766d7903def---zofajakadapigo.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/86922741697.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///50474964974.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3498702b3---97342327839.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0ed17f28c5d1d50d56f91fd118e77a8a/35398989223.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/b9a3d1e041ad800c80f6600e16dc6495/vamunogodexelerideb.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6476c111ff---3504158265.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/27988299155.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/83406943518.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16082b149db9cd---mobakirod.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/latasiwa.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/luxogivuzumuluvaxuj.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/93262148412.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/palv0makv83bootgunkalnfegr/kawodorexebenevani.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fedbdb2ca---50161052622.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fk581a80rhug3hprgd2b870hj5/1697347407.pdfIn PDF document text
    • http://nanosoft.mn/images/content/File/67124027649.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e878a4ab3---ritodumejevug.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/16179167230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=como+fazer+sum%C3%A1rio+no+word+onlinePDF 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_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 19476 bytes
SHA-256: f6073bb746b079047b44b4c4f18590ccae84c2e9469f4b06bfddb720ef40ce4a
font_01_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 10876 bytes
SHA-256: 15438951b0757b357fa4337d82f6c18d90ce902ea4f5ff49abd2cf8ba4ae8d78
font_02_sfnt_off00013c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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