Malicious PDF — malware analysis report

Static analysis result for SHA-256 c309b4401446ae84…

MALICIOUS

PDF

86.3 KB Created: 2021-08-30 16:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef69ef307a54b6668bd48fac3de82ef0 SHA-1: 7c9db0af30064897b48bcf8d7c1496de7cb3fb1f SHA-256: c309b4401446ae847278d5f9dfd0db7e77c0c1d8b5e23db6f3ecdc27b338fec2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chcial.ru/uplcv?utm_term=free+video+wall+template+fcpx PDF link annotation
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/672af9adede85365239cb2af37e9c5c4/fizeb.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/zedezokamibibiwofo.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/dejagifalusem.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/42b8a0ac54f283dab5ea368469e4bc38/40001385165.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1628138168.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ckoki1nkkf7n9ivqv083kqeji6/wuxafigel.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f10ed1f79---mopivuwi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c7be63e44---fubutipupotesojujinon.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/renozosojake.pdfIn PDF document text
    • https://atiksigorta.com/files/muwanowigejawivin.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/76191715406.pdfIn PDF document text
    • http://annabarons.lv/files/files/29515999754.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de93d221592---60780869940.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ec6a857038bd549e9a54cbf243e98997/zodudajidu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0732b392f95bc7e784ed5ae581fb4279/46565981155.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/005b410f68c340b3bd7f90aa0daadd2a/30100649356.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/vosofipejobarinuja.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/raxaxixomilawisakex.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fa9rs2fe159b9pg8f5p8o4qu5j/29104051866.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/xowofijetojexusuxapogo.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/kerivexotewalolexa.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/wenodafuxedeve.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/zisulum.pdfIn PDF document text
    • 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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 10740 bytes
SHA-256: 1a42d80512551ae3a78f1af159d05af7104d6d4b78bff285d057469920992b3f
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 18584 bytes
SHA-256: 61ac80f21a02453b61e59be19c21f441eab2ed949e8267a9623d2365e0f4fad5
font_02_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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