Malicious PDF — malware analysis report

Static analysis result for SHA-256 989b9cfcd8e34106…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 16:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9da214012100d4cffe4de9badfaf71f SHA-1: a5542e99a1eed785e613e174a887553c389af6d6 SHA-256: 989b9cfcd8e34106a04a63662da28634e35e231f94099caaf9e36735adf687f9
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to phishing pages or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3c56a4721---52316937091.pdf In PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/mujibozexunalovagibofov.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16071c906b0948---50718012966.pdfIn PDF document text
    • http://espicycooking.com/files/file///40242025597.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/zefominimivog.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f61d5bfb443e90b91a2c8ece680a069b/1104828963.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131639f4b17e---77216653990.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759f93dd8fb---gatagutixesobulab.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/bfc4cf52be57f9816cfd7af1cac75f93/70436980883.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/vesukinitonive.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/be58e30f93b44d0c91bd2477f42545b7/fidez.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9f554480---xoxurepeduto.pdfIn PDF document text
    • http://speckrepej.com/upload/file/vuvavufomizejezixuzuselok.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/83062698872.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/vijagedop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fdae9040f---25762190564.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/muvarapasozuzozoxepufa.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/336860e18230bf7245c2fbfb51a8d97d/nasajim.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/katidajus.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/kavanefa.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/91015905330.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/wanuzeliwivozalonagom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=argos+catalogue+1985+pdfPDF 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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 18020 bytes
SHA-256: a236d9b4fa5bac38922d1e9e2e27a66c0f5e7ec0f309a563373b4bdf46ced7db
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 11244 bytes
SHA-256: 3d9aa5ea1e2f3d4c3f27084b61dc70f8f575a45a3453552e3b8116c6b4040c7b

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