Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fca0e854111f18…

MALICIOUS

PDF

94.6 KB Created: 2021-08-02 17:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dbcdc57a93ffefab77917047e721edc4 SHA-1: 69f0ed7bcd792b02e7c8d46881dae6d2560918dd SHA-256: 97fca0e854111f180c957f6eb766d9021e5aff6c0cac0b7612c216511fdccdb1
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bacninhonline.com/webroot/img/files/19736995933.pdf In PDF document text
    • http://allamericannursing.com/userfiles/file/57921678260.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqk2pchjpaokiprssra9gkivst/muwejopifezu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/hvr1liqkoviffaag2g4bj2d701/vanaladetuzafuzejiwuv.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/63009780803.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6028910663baff0d8eec31aeabce4bdc/43621963732.pdfIn PDF document text
    • https://patc.fr/imagesfile/somenisejesujamasu.pdfIn PDF document text
    • http://btfa.tw/upload/files/rupijujusobos.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160797a6de8d5c---rolidawubopa.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/r7q5olng0bjdg5oktgcq8fk12sjards5/vazalefipozamedisazof.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8fr7f37huk7dujj8b7kj7rkft2/vamuvomugugoralo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb03d02f67b---32946782407.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c369c5168b2---9561568883.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/nudomuziwinigejefikug.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/73653992188.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/rokutixuxomijunenaje.pdfIn PDF document text
    • https://medtek.vn/storage/file/tajir.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3e1b4dc4c3d7476b1c168674eba29d67/pejixawov.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/vevuj.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/74657141887.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b18b6b863da82eb361bc3f1d834d09a1/mewuwobijobopasi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9442e016a---6170074403.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500f4e658f---51905950415.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e40df86e858b9e55ac3d812a3c8fcadc/80347660053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+infinite+coins+in+brawlhallaPDF 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_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 10832 bytes
SHA-256: 51d4a2020187a8d957e77a4f9eb6c6b3c9ca6d90b033ae68a841999d9bf1fe5c
font_02_sfnt_off00013c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7A 17776 bytes
SHA-256: 779d7d8d8de59b09da48f342bc9acc7aec9a1b189a0aa263ddd202c651ae2b2c

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