Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe0d2906ef5da39…

MALICIOUS

PDF

88.6 KB Created: 2021-06-23 21:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f4652cd5c4b10a277175be992e745982 SHA-1: d90f09354954877f74f4e668ff7d9561b469e0c8 SHA-256: 6fe0d2906ef5da39175a6b43f72ddec45e6916fe8625ac1724b819dbdb8a92e8
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous links to compromised CMS upload storage and disposable hosting suggests a phishing infrastructure. No scripts were extracted, but the overall pattern points to a phishing attempt designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8fbemoths7u9ia98c79e3351r1/43752617650.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fda4a5f85---zeritolofejanejokojubafi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/66259e75b7be8c5ea7aca4cca3c7c095/xefugaxenozavolomen.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/dabimarefomimox.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b357ad071f---71477595745.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ib20f2oifr2ubbtc6sl2qemelv/49815130246.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61357bb73---dufipevit.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/6l0n8m888bkrrcko9qd61i3lep/96177142935.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/kejirusajejanewonizaxojo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4ebe5d78dbcac82155856f29b7eca635/zesugelobosijojoduxume.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c879bca2c---68378089177.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052809523473499.pdfIn PDF document text
    • http://lblussana.it/images/file/tunuz.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8a8189f31418c100d66cb2b64aa1c24c/80382487538.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/17391726385.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8bbcfad7bc2994938cff44b6c9e6ae5f/95082893353.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210607_77C6DE8715F48574.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/j8ur399lv076ptpdm81l0ndtv1/38944672716.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mikro+c+manualPDF 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://scripts.sil.org/OFLIn 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_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 4836 bytes
SHA-256: 51a72c7eae0a40f2717ba19f576c1246a69265fceda50d422c2765a9b5758ebd
font_01_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 12512 bytes
SHA-256: d90a55cf4df3d53049a08ade2b9d0cad04dfcf53c0728655aa09de07551e6e4b
font_02_sfnt_off00013e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E78 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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