Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dfbcba3ca98f42…

MALICIOUS

PDF

132.2 KB Created: 2021-07-09 14:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b2901cb614085f811f89e6eb7dac723d SHA-1: e8f0a1d4b27a55a71ddd84c7c79751a9ee5cc548 SHA-256: f1dfbcba3ca98f42e375c39bdf4f9a3f2046617abb63c8ee1b754d7092c4fbc6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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 http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/waruditofotuji.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3ba980e8---61310076692.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uvoo6h6k6l29ud8qddbvsl6cl3/10004412313.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210604160031025.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/58de0804801dd07dcb0ca5c623566330/gogazetetutegusovuwid.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ca809207---buwebapokibadalofole.pdfIn PDF document text
    • https://seikico.net/img-tym/files/70328149090.pdfIn PDF document text
    • http://zuche0551.com/upload/file/57987872683.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee0150b33---vitaxuw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/46d8d233b5d07922911874ea98432020/gatuvovutavufoxajam.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/gezoriv.pdfIn PDF document text
    • https://migger.dk/userimages/file/79026399044.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/pibaxumunono.pdfIn PDF document text
    • http://synergyproperty.com/images/files/pamigej.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e3edb7692796be12c51a784e222400ed/78323968005.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fe960be7803c74c450ba93c390c9a116/35068238749.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/soxeferepoleti.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e950d1b1c---kusulukowinakikok.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/bemap9ano3rdm874fg65jqett3/xoranufi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5lirm7qgnop496fl0m3rg376i0/panoxobapasotevewema.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e7e7860fe434dec4fc58ea7d0f26bf4e/32609900562.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625696028.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5a884680a---555076259.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0on8qnjihs16erfvtfrj0l7413/luzuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=northern+rescue+cancelledPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000182c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182C7 18672 bytes
SHA-256: d63316c9f9e4c8f6a396b84ba934e91512f1b4a2f7b1dfd3356047edf6bfb041
font_02_sfnt_off0001b233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B233 10452 bytes
SHA-256: 52f5002e3ffb77a6da55987c86b2bec8f48441057a87bfaf1d3766bfd350c6b1
font_03_sfnt_off0001c9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9E3 18996 bytes
SHA-256: c030fe52c65b189be57bc7a26c950d95b102071607b35f557ad966a682a24fa3

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