Malicious PDF — malware analysis report

Static analysis result for SHA-256 698f672cb82eadbb…

MALICIOUS

PDF

89.2 KB Created: 2021-07-07 02:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cba8d2cd4bc09fdf6bdf1a21d57f7371 SHA-1: 06a09514803ba514117ff9f17ca6a30d95306747 SHA-256: 698f672cb82eadbb9ae6f6c0d1f1aa5ddea7705d1ff31f9b2cf0a895046b44d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laborke.ru/uplcv?utm_term=so42+formal+charge PDF link annotation
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/tpqhq4hr2st2qfht4jh95dpv5j/50554331286.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bo57bv4sqtpq5cdt6tirmqhai8/24948365368.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/xomipitulubex.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c628f9a4cae---79391938334.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/65604826159.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a2d388c4211bd2a8fe414018f6cadae8/12122669527.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d744d3d62d79dbeb76e8bd770f4b7b7a/75090721226.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/88702887184.pdfIn PDF document text
    • https://etimes.mn/uploads/files/dugodijurifowi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/10c26a1e439da6e254569f425f6ac190/dekovali.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab8f03a9b---fipibepemu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g9otlemfkcacktm8ups8u9p7ut/rupunuzuvij.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/fadefewokanukux.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/567650388d18d4913a2c79620cb2d3b2/94207043253.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/poxipobedalepojexagifibos.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9886d67531d0d6a1ce4b99681605153a/witisugagabomipijimuletup.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 10592 bytes
SHA-256: d10647093c03abb8a9eee3f2a71f8db83b55dff216cd2ee1fff217d8666c5c60
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 17408 bytes
SHA-256: 6c5bd144b2d44754fe562c40d8546a19b063037e9d13d36dbd588b32326e1ef0

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