Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5876e941c86d463…

MALICIOUS

PDF

74.0 KB Created: 2021-06-24 03:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ed6bd21e7edad4854c785c96acfa9d8 SHA-1: aafa80c7c10ee75392530a7f96e76ba033322367 SHA-256: a5876e941c86d463b281738e9526f076a4bd72e220eff73fe78458686589e178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://emilline.dk/ckfinder/userfiles/files/suzovikazififebosinu.pdf
    • http://abnicum.com/files/file/68877924684.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/87371327596.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f7947c754---2730068178.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/27174989692.pdf
    • https://mahae.hu/files/files/32089516729.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fixawonas.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2rk3phgf3nuhhs5fu7aqbn1826/vilukokewigisaz.pdf
    • http://dancephoto.ru/userfiles/files/17979416892.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/s6ct5iap8dbfun8b2f6g39ojq1/basugotut.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/795f38f9239288f0da8517f893e3eaf6/23034507923.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/909j9ol7uv9m6v98dfpvklgsm0/zasawokewisovuguvoler.pdf
    • https://rivaflo-south.in/userfiles/files/zobigidivakasopekiga.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b403435a79f---rejinat.pdf
    • https://marljivo.hr/userfiles/file/sabur.pdf
    • https://ratco-hardware.com/Ups/files/woguzikabuk.pdf
    • http://fantalife.nl/userfiles/file/vawetozuvarawesojidabej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ncert+solutions+of+vector+algebra+class+12
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1b.bin
0060fd2bfbce45e3aae2b345a1800411a61b7365c9feadd7dc271d58ad26f5de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 5400 bytes
font_01_sfnt_off0000eea3.bin
37fba2c1112cd1026db38b2d091b12d59f2a44e992150baaf7f8998dbbaac637		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 13068 bytes

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