Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e8e5540bd58533…

MALICIOUS

PDF

117.6 KB Created: 2021-09-06 15:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3717d79ec3051a88482426f63e1865ae SHA-1: 8f68ac07abf55e8f995c8c9a948c5c75d27d54af SHA-256: f9e8e5540bd58533a1d08a05f22abe2ef9b851eab20d32b2ee7a7bd5a2d4b395
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160705c242a6de---67744282597.pdf In PDF document text
    • http://pb-book.com/user_file/file/20040238120.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb59f0c90---56831356081.pdfIn PDF document text
    • http://camonetinternational.com/files/file/85101627697.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d853772d45---mulaxibog.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/jesefebox.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ssr4gom3pd2n4drkebpaeqi94n/59875956450.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d5acc0226a396c2701fdb9d6c3ba01b5/tonalopekulu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/50905628149.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e79394508---87873653793.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0697434edbf0dfa43e90f95d783034b8/betawapopizur.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b60152de02---belizivorijekasukumug.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5b4c3aa0783ba6ca4b8d445c4368022d/wibanexileno.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/39255567481.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/7194750332.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/76215439025.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/lanul.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/49402823714.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f604908f0de81652ab5dc46cf18ec8a8/25501267567.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9ca64416---66599299991.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e7d34f3f---xopeledunutunokobamide.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f46dedd486fb19595c72fd5575344bec/sawewusojafaniziwo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece39c38eb---21459951594.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4f99a49a---gakopifedufogesugew.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/nonijuw.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/80339555832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ipython+notebook+to+pdf+onlinePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/marisimetol.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16493 19484 bytes
SHA-256: 16148ab2a8108806be6d769cbd2a01569a3e87e10b52026244e6658d303da79a
font_01_sfnt_off00019893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19893 10464 bytes
SHA-256: cd5463fd523bba1b51cafdb40d2325205f126d331f2d2164d181eaa63fc38e8f
font_02_sfnt_off0001afff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1