Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8b9261bb4220a8…

MALICIOUS

PDF

74.7 KB Created: 2021-06-06 20:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2998cdb3ded566a39c96dd47527ec493 SHA-1: ec7edbbb2b4a6f99fa0524bc84411fc0ccdff2d6 SHA-256: 3c8b9261bb4220a882cd5b978b6a82f42c1d8d396af816f896e17c28edbf457b
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains a search term that likely serves as a lure to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://drafthe.ru/uplcv?utm_term=arabian+nights+aladdin+jr+instrumental PDF link annotation
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6b8f1aee---lirofabaxojax.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab46877252d---36920064071.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/53204502862.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160700fc7d2666---48289431034.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/v4o9aml4ug2n184466fq9ghckn/75908457368.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c20f59b41---jikevev.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/84637088540.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rsjpntul78pmgpdheecg0iqcfc/lugesoxabipikudi.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097317176635---97354793487.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/55852278958.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8af7a9a2efc67532b3f460d9c2b84e66/13348342975.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/93520465077.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609508a1ef382---bulosatosuk.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2270d36d6c---67427116194.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/9b5v2k06ao2o5dq1r8r9tv054s/96524145965.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/f7r27htalpf3esbhbg4om2rmmq/25258339050.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/51e65049691d4cd33c4bd2ba38d4db21/88618528717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 4268 bytes
SHA-256: 4dceaa0adefaada698c5dcadbc9f87b4a670e6bc58d77703cec98ae56b847311
font_01_sfnt_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 5444 bytes
SHA-256: 8874d8b7d04c4ce5de9b21e632b71b48ac882c7b3bff058731a693f10d63ba53
font_02_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10852 bytes
SHA-256: 8325b3608ebbacd9ced737ed3374e809d278248f3a727d47594f8d9dbdd0675f

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