Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1c96281680c994…

MALICIOUS

PDF

77.5 KB Created: 2021-09-03 04:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9af338c9ad34b9b4937db01156b07840 SHA-1: ac6c0e293950b021b0a5c229b5ac49f01518b337 SHA-256: 0b1c96281680c9945fb8e68902820eb85b7960571eb926e80f4cbbaf04423c2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be SEO poisoning or distributing further malicious content through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mediaworld.pro/ckfinder/userfiles/files/vusegavowesakarikox.pdf In PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/29327841789.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/34246561160.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160befb56b5ea7---zuveroworimuwib.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/xexituwofunox.pdfIn PDF document text
    • http://innotack.com/userfiles/file/zoxogexidalawuzi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16128d841cefc8---18489465109.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/37994154178.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/mevogofebotakiwu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a99514a6615---vokazubetifewa.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/38985570192.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xanifegezewali.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/werolimegetuw.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/24236214453.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c34db8a4f---xirenivolin.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/jofapariwi.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/10500014031.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b873a1bfe6---73639534372.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/70527981845.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pf5blpuvidfhrpk7ifakg3hjn7/kapokadudizokelanuf.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160805e586d2d1---jibevuwodimosewolegevur.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7ff46a4b7674760193ef1e1deabcddc9/lunufevorodobikolux.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/55573438723.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/vixirowasume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=droit+international+pdf+gratuitPDF 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_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 10608 bytes
SHA-256: 3bc2e3ccca30b3bee07563e4134a8ecb9f0338c1b91f2eecc6cadd250c838ab8
font_02_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 18772 bytes
SHA-256: 7ee471da2abdb1165f792b2d811aae2c239b3dd607fffb145d86bc8f8423183b

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