Malicious PDF — malware analysis report

Static analysis result for SHA-256 43661e89ff55c149…

MALICIOUS

PDF

88.2 KB Created: 2021-07-18 09:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a83bfaa60a687f04aa861a8b7ee293e2 SHA-1: 6ec1b5e33d9f47062d080be930076df2cb79c68d SHA-256: 43661e89ff55c149879d2a52cb1684c18266da253d1020105f59e517fbfaa857
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9826

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbeed71dab---22384183021.pdf
    • http://princeton1959.com/clients/863834/File/69546396130.pdf
    • http://www.awakohchang.com/image/upload/File/ogodudetebonaxaxi.pdf
    • http://dlzj.net/upload/files/20210612142342245201.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/20592151389.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/tifevi.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5881ee067---55969787267.pdf
    • http://strahovka66.ru/userfiles/file/raned.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1efee12e1---menorafewotuvakemopa.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/bfa1fa7d57c23c384adde33ced461ac3/jezawezogemafapawariv.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/niwudegobodelu.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa8d2a99b---tejodawedilexilexuvu.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hia3gtpc59o59rrsd1j82ovul1/16247186837.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/lesozev.pdf
    • http://bulk-supplies.com/userfiles/file/podelel.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebfc2ec508---fobetemawuzejujawudolo.pdf
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/zelizatezedaxowinulej.pdf
    • https://allcreaturesinc.com/files/files/85298360420.pdf
    • https://abeess.com/userfiles/file/jakav.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9998bb00---60621847188.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m5f5nqt75h0l2d0fr13lln9oqb/pazinipanafaj.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/25866946115.pdf
    • https://casabresciani.it/uploads/file/pafelirogoluboz.pdf
    • http://7seapharmtech.com/Uploadfiles/files/gulos.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/71111737bad7dc4b294bd66b18897949/38054929452.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/83a3ab6abf2e52ace30692f6d2ff9f78/20174116418.pdf
    • http://ruresept.ru/files/file/vegojomakabowiwimapu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9159b37db---fibodova.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mass+spectrometry+notes+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_off0000f654.bin
ad78518265c39e3faece2cde44cf94ec992ae3d6cc2f46d39c7811d0ea2ffb90
pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 16900 bytes
font_01_sfnt_off000122b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 16792 bytes
font_02_sfnt_off00013aca.bin
78765760d6e8dba0572a6d8d78bf0cd3452821c2f8499d4c953cb08886fa532d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 10752 bytes