Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac46ccaf3110234…

MALICIOUS

PDF

135.9 KB Created: 2021-07-15 23:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57f51586896bebfb9e862f4e11145df7 SHA-1: 91b5996ce06ecb516ac3b108060421273eb6b728 SHA-256: aac46ccaf3110234d10c091ed6bd9cc4585840ccd4a0533bc3eb2040504f3a0e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple distinct hosts and the use of UTM parameters indicate an attempt to obscure the final destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9782

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=rick+and+morty+cn PDF link annotation
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c3144f653---28926418778.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/196800f6ce0f03f4293f5e2cf472e482/79853763271.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b3d3ee822faae30462bc5211aca0c264/22065331904.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c03773411---rakazija.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59b988aeac---bademepugan.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb9494f22d---37425792948.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cffeb3003---fepetexolatozul.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/20749835973.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bea8876dc---64851493345.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/bonat.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/g747mf4nqc21j8o4v1l9f1di59/neluxamezakitu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9861e19c3425260bb7471806227fd0e2/jubilusadofurojifevonax.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/8469595798.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d61eae1c4---16980829283.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/53011420951.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fd86090c2d52ac9e9f6e084fbd90c579/kerol.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/aa3c54ded306a63279bd3f4b32f0e8e8/getimerofasunus.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/binikutapovijadafaxoga.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/ramaxunazeriledetepato.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfad11dd997---81512953314.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210629105040.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b33496f2b---43736630947.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4333410bd6624b3b064a292fa4cbb934/dezesejorumepudas.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e52b3ec7ed016487f7ff5b155bf1fdcf/12722397697.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/guzumodifelokixenolil.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000192fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192FB 10436 bytes
SHA-256: 3889bcc9c359e91dd8116a0cb21440973d4108e759915c3e61dea957b5872342
font_01_sfnt_off0001aaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAA8 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001c0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8C5 22452 bytes
SHA-256: 56e9cf3cc5bbb01d69bd0b62a60365c1b1a2951f485beb3be788e773072e81c9

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