Malicious PDF — malware analysis report

Static analysis result for SHA-256 3405837f5203d824…

MALICIOUS

PDF

94.9 KB Created: 2021-06-19 13:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2e54ec601c4beb8d1f067d8b7a17ed40 SHA-1: 1d9270badb6c5d0d17456c8848ad839953668f87 SHA-256: 3405837f5203d824d9c7e66c62e3e9759e47952c8dbbcbb7957f0b50c7a73624
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised websites, suggesting it is part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document's structure as a link farm is a common tactic for spreading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://medvor.ru/uplcv?utm_term=monster+hunter+special+arena PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d3357f2efbba096c226f93ff9e45f4ed/4107596540.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5hltefcbfj91qfgcb5272ml4r7/3735197320.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070810e7e24c---91176686223.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/sodanarekez.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/psabqvtsnrc1ft48j7da60aptc/46950549702.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/livujefazanakubisulox.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/de4a51c623decc4092e3d86f358fdb29/xelanojimutakuveke.pdfIn PDF document text
    • http://strandedtattoo.net/file/15064468255.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b2979d25---pexune.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/29706402947.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16087e164b5a3e---86728435146.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pidazepowikopuze.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd4aafc66---fuzud.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b325d778c9d---lixigokifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 5684 bytes
SHA-256: 479e8df89cd60dd14e5d58551c6c06c5f3acccedc92e63a4cf2121e96340401b
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 4908 bytes
SHA-256: dca97f2ecaa711e4b22d4509ebc2a7ad00fc2a7a885fca3874d82797422b4546
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 13080 bytes
SHA-256: ffa9ef7966e1fa53ec0b684bfc287d93f8fa67b45ef464643d589ec42ab7606e
font_03_sfnt_off0001486f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486F 16744 bytes
SHA-256: cfd706ce2db1da7df4f20635d6d587b3bc75c86b15c52eae62940b201b7620d2
font_04_sfnt_off00015fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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