Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab3c1cdb46b35c9…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 06:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92c41d533cd8ebd2cb7a43f45376a0ec SHA-1: 52df44520b1a3c6662a32624f2505e9209eee0c6 SHA-256: 7ab3c1cdb46b35c990e95e4594fe670c683012a73f70ac4173edbb8d099eaf8f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malicious content. The presence of `utm_term` parameters in some URLs further supports the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=leave+application+for+yesterday+absent+in+school
    • https://belloverde.net/emailer/file/zilovux.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/06fb40f8992bdcc0b89270129c011d81/berosokadeluze.pdf
    • http://fmi.lu/userfiles/files/gowitapotugezovexum.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608621b765006---54645607450.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ad00635f7---zonemabitokimizanovuvube.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/bfe8cc77b74a4a2bde50ecaa4aefea09/93171735079.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0ab175afc28045af43c87da4f6a432d6/lotajimufisopiko.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608429274f3e4---52431827042.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9b3ca600---kaxizovavilifufinupup.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/309500f239a6b7517b8ce88cecb4af61/32783665925.pdf
    • http://fkhd.cz/data/img/mulukev.pdf
    • http://szentdorottyapatika.hu/files/sewuloketezotidonaxode.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9559af88235b8c6b42bd795f4962d77f/wufupuvonemivapogewi.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ec591284c879709dd1d7d148c9710798/15141711192.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/aadc75f540d54c00f1788070f978b5e6/xilazudubemofalo.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eaa6913d1---zetawe.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b946b0ee5---tudonuf.pdf
    • http://www.deopendeur.org/imgUser/file/kametifeladega.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d51b738e90f---71959069845.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae019d7321---vewiriwilesujemutodaletob.pdf
    • http://northcity.rs/slike/files/pufikezinenu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e5c392ccb---febiwonodeg.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/3c86188ff1e84bd028cfbc4b0e60eb24/80589674459.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rl2igit0a4ilv9fcb8rtv5mu81/37658671748.pdf
    • https://strechybenesov.cz/content/juxezagufune.pdf
    • 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_off0000f105.bin
9466690e09384c72d682a594efe5a304623f4924b3df2072b342cc43029de19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 10996 bytes
font_01_sfnt_off00010a44.bin
580783853e8a25235056284f537fd5c5399e435f9f03041fa39f25c55da44549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 17256 bytes
font_02_sfnt_off0001372c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1372C 16792 bytes

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