Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e339af30cd58be…

MALICIOUS

PDF

72.4 KB Created: 2021-09-04 10:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6a9095e742a6c5639591b7a3606c4e6 SHA-1: fb6a598df47ca95d10eaebd94e87c629a811dbdb SHA-256: 72e339af30cd58bec373fd8da7474c852c5835c6c361d4d9dbb6513be978ff7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://krisoc.ru/uplcv?utm_term=macaranga+tanarius+pdf PDF link annotation
    • http://greenearthgardens.org/userfiles/74966863181.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/dedarizisunuzexifiku.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/25464488405.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/48843721035.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/7aa4448ad1fb76f972480d462357a63a/53162018974.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84a9d481e31f0c8d957949d332395e42/29249538673.pdfIn PDF document text
    • https://ultralloy.net/upload/files/31206896972.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a45b31cce---tegalizolilesuful.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160721046be046---52979684984.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/paruradosodiletukopunas.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/33712b8a33386c8b3c0a81eebc54dddb/56311054637.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/75921645621.pdfIn PDF document text
    • http://dgjst.com/upfile/file/46733428430.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9308940d5---rabevawusugipuwowegufufe.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/46194533078.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/81169691927.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ebb1c576e59a8473eee518a0da03eb92/nomomibuxaritojepuzomora.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/pilafotokuxokegixupa.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/56614833366.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/damirugemenidavo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0osinhugrtaiahufuo7o7fvm17/66462172149.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/3567471894.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB75 16224 bytes
SHA-256: 1a3f4d04c85bcde177a024cfd15320391c3c9877a55700376c53565687cd5722
font_01_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 10588 bytes
SHA-256: 79153fa269258a7e551a97def73f454736b4278e792d0a26d4830f8dabe1b0b2
font_02_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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