Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ca9bdf66a2caff…

MALICIOUS

PDF

109.9 KB Created: 2021-06-25 17:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a50740d297a75c8a07edf294e060ffb SHA-1: 44bb7d50c047195df45ee97d2b130de799075437 SHA-256: 08ca9bdf66a2caffdb17517e354829bc82a3a76e1759032c3b736797b579602a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to obscure the true destination or leverage disposable hosting for malicious purposes. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5b9bef975be63ec048d89b95ec15a23d/63642012103.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a17c424f---kemusoga.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa0e05ea46---61742372305.pdf
    • http://amandatravel.com/userfiles/file/xirevuwozarodejiwijezibu.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b5d5f320---95081271387.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/32d23a0ef0c40b51adbd4cb651462d69/nabavuvugefowulupiveg.pdf
    • http://hasici-pristroje-eshop.cz/files/file/54270680656.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/76ebffdbabb5b4e533f3220094223093/xugalipelodinikon.pdf
    • http://tokyoto.pl/UserFiles/file/xuramokop.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/xubuziwanenado.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0f382912---wurinovob.pdf
    • http://camonetinternational.com/files/file/jizololojasipupa.pdf
    • http://accronline.com/userfiles/file/27892259718.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ede746ccb---vugafojabam.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6669c4540---13532829508.pdf
    • https://arrayamed.com/userfiles/file/3056264386.pdf
    • http://youngshiny.com/userfiles/file/1624385339.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32fc3aef3---59190210538.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c45b31c2392---87751203966.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11cabc1ca---rokobovinexufeluzisapo.pdf
    • http://adance0112.com/upfile/editor/file/lofawanidodowolotitovul.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7c370c14a49625c436360b69c9a52a4c/71836981550.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608501bf0b300---96443993568.pdf
    • http://engroupe.ca/aym_image/files/pesidasevate.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=world+english+2+second+edition+answer
    • 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_off000144f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144F7 16792 bytes
font_01_sfnt_off00015d0e.bin
350929469b9d9dda0dba69a8702829234c42b11efddf3708b5ffc0e3ccd18c1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0E 10848 bytes
font_02_sfnt_off000175ec.bin
4db3045b408f2b1f01ec8a9f05ca62cc391c89e2668c4c9cfb833efed7d14bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x175EC 20808 bytes