Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cfc84fb1a46c0c…

MALICIOUS

PDF

93.6 KB Created: 2021-07-26 05:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 436189dc24a6d5dc36270b7d9bdbca48 SHA-1: fd5352c66ad8635c1bb9df852c00a8b0dc48c1f1 SHA-256: 63cfc84fb1a46c0ccf9c805b779f1b1f5d89523e5cc318fe271d2642c36b913e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files, suggesting a link farm or distribution mechanism for malicious content. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/58daf617c27b4eeab9d7c2391afcb6d6/zinemugir.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf0faf286---fusek.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/l6ajksurkrod3fh4m2u8ugbo5s/93677302559.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/89002959109.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c269219e78---98936260359.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a6146bb9cd9efdee6b5d24042704a6ff/ponijurolajugaf.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/76554157889.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/fafupovavapujupo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qm93db308e5jaqknqts8i7ivk1/10159266464.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/siwenozawiselidaxukikeden.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/m304bm7su80i5ob6gvacrdjjuc/45972838285.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833fbc7f0ee---xisuxoj.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/jawisutoso.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/povifiroroba.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ce17acf32c30166322393b9f3b286ca2/satoganowasaponodova.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/96478743536.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/19fa1a4f15890cf6ba15b946a2dfa85e/lewin.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/26613438056.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/11255cea7d3f63255c6ec3aa96e8b1d6/zejubipomuburidevevivedi.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/94g58etecg9qlh3k1er84oj8hu/56574135814.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/87608918894cf6e50ce08cf202ee197e/64871017513.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608345bfd807b---turaranugutazam.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65ce3087a---sizovibusatasaminipu.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/90995493387.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/giriwowofifim.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/49194901742.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/zotugusonagabudarewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+giver+important+symbolsPDF 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_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 15836 bytes
SHA-256: 578c22bfa2a46a9a69de5d74fdf84ae50932fdcf934c8a0f84f7dcd6b75e161b
font_01_sfnt_off0001381d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15034 10980 bytes
SHA-256: 64a52f93ad0f8b3561a57eede03868e27feac5003e000f59b1daedae078b1c28

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