Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8bdf42be7f05c2…

MALICIOUS

PDF

122.0 KB Created: 2021-07-15 21:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cac69871251a6cdc684dc63fffc91dc2 SHA-1: e5f3c24bc00034418c0c96e27cda8065fd70d8bd SHA-256: ac8bdf42be7f05c271cd3addd6a809cdf542fd0f5503dde4485c59f632be3167
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://pronobile.de/catalog/file/91275846137.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6e14cbbd2e829f2c410c87a9ad6143d1/kifigujiva.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/51d9f12524b942231fa32291a93a58dd/1961786576.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82bdea42b---21311429522.pdf
    • https://allcreaturesinc.com/files/files/37586988554.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3iu95se1goec4mhlcr2ucbdc5b/76451420947.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16086aed3251d0---pokakifamawapelimunupazem.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081149bc9c5f---birisowupenitu.pdf
    • https://radmangroup-ye.com/rgfiles/file/kifomelawovetepa.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8ad7cfae---fuseg.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/fugakamujolevuxox.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fe7cbf25a---90812514789.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/81836041c74d75c18b88f2f89c805156/fagezoza.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/77d3c9603f6ab48786a6f4f104ac281b/simisab.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e603b56ad7---dabilij.pdf
    • https://bookatowncar.com/userfiles/file/40940907956.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b127e279dee---kuranefuzosekobemosewesib.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae76b5d2a---99448401457.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751985e9f45---58964755036.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0o7v6h5rr0a9puvbvg86n070rd/dakafozalozisifigam.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/14c1456f1637427d10c9a0298bce8180/juluki.pdf
    • http://www.logomarcanet.com/userfiles/file/turinusiguvew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dactylitis+differential+diagnosis
    • 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_off00017a56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A56 16792 bytes
font_01_sfnt_off0001926d.bin
b694891e612a3eebd10115b49ec06b1eaa513a32654750e1c089c6a02d31efa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1926D 10764 bytes
font_02_sfnt_off0001ab26.bin
39aac20b2731b430bbe24ff488efa4135d61294d8b053185104ca54f52f07e91
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB26 18048 bytes