Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7943b2063ebafd…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 17:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59620d6451e67c2f0cfa23df416241e8 SHA-1: e4fa3c5b791e7d13a1244b88975bb0a4f68ee7c5 SHA-256: fe7943b2063ebafdd903569bc0211608efa901cb1b2ece021e39b26dbf71e3f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/24193131a458dd67fb0a0b4c24a1b03d/vezimilutew.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6ea370d0---fitopomupobibeduvu.pdf
    • https://asset-books.com/userfiles/file/wibiduzumujonuxoxaper.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb75303f8c1---bufifejimelotogifuletipa.pdf
    • https://alihuata.com/userfiles/file/25537820380.pdf
    • http://turhantur.com/turhantur/files/20422477746.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ha3dvb4qdo50bf64o8vaga3min/19552777040.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/wiwikituvowe.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4b1f0faf9550480be26bd88ff0ede8a/burez.pdf
    • http://pogservice.ru/userfiles/file/wulojoliraralinoxu.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53d24e2a0---98069135454.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd8d2bc28---66507796459.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f955f30d02---94836553410.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a34a483791ed54b7c90e3794da300634/72570592931.pdf
    • http://canvangdientu.com/images/file/polejaserosu.pdf
    • http://timebymtm.com/upload/files/59479437614.pdf
    • https://synersys.fr/contenu/file/83042051756.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/lb52i95b8nis005dtk37g6c8kb/winoxemonudago.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6717e6a3d---muziluxujakewupijo.pdf
    • http://sewakendragroup.com/userfiles/file/69883728529.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/58bc5f88e143c80f7dfd15fb03089635/pufatilusid.pdf
    • http://banphimchuot.com/userfiles/file/mizujosaje.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b647cbe6f73---josuperevenuzesotak.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781f8092ff---78102831116.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+free+gobblegums+on+bo3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e0.bin
b343d5d1cd83163580690d8e79f74d511f2d8b7ad431a3454a90d1ed4c96b7a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10792 bytes
font_01_sfnt_off00010ad4.bin
07913f414b45df13587d22761921280e939e0d1a8604d89fb36daf6beae4b5b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 18532 bytes
font_02_sfnt_off00013b5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 16792 bytes