Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c15325489dd4d1…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 21:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59691542067ed2039c7243cda4285d06 SHA-1: 51341f73955e0f79954e8d264cb6c0d135558d2d SHA-256: 58c15325489dd4d18c6927c5ec86a78042a12042e9a50cacbba005389b382ab4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be junk data, not user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abf13567796---vesewapasebubimoteben.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095795bf172c---81013111651.pdf
    • http://apcmagon.com/userfiles/vozavemafuna.pdf
    • http://brette-animation.com/userfiles/file/mosukopivulujusovav.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bde6b5bc75ccdd4227647216f3ec04d1/bebifozafakoxutamerob.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/rusuwezorowub.pdf
    • https://dannysacademy.com/ckfinder/userfiles/files/73257608145.pdf
    • https://floridainvestment.cz/files/file/vifosi.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/oudsp5l2lgrvqnjntr91qok043/zoton.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edc999ac91---niximilezunuwiliteso.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5c85d6ae---86543887775.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4e9ea306f5d3045404422a0c1b258c30/xixodulado.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b160f8dc4c0---kinunuvopivibofel.pdf
    • http://novussiteyonetimi.com/uploads/file/74021671802.pdf
    • https://nanyangtextile.com/userfiles/file/20763658814.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baae4a69c3c---77808700975.pdf
    • http://yaeram.com/userData/board/file/tegapumesusojerubipifadav.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/035d8e0fa8f9f6372cf81ca360d2436e/73448529649.pdf
    • http://penzionklara.cz/userfiles/file/zexelevuroponipoxifimin.pdf
    • http://unseretochter.com/images/file/niziwukiwebamidinewoxex.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/c85bnda8log98t7vsldgk3gcn7/folojololorivakowe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=applied+survival+analysis+regression+modeling+of+time+to+event+data+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_off0000f559.bin
b3d4fdb4a86e07d971cb1281b2d6c82f37c85b101c439585c4ca1a6104dc2b29
pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 11104 bytes
font_01_sfnt_off00010f1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 16792 bytes
font_02_sfnt_off0001272e.bin
360f06c2e6ab09c7c9403184b09e7d4a8366e7ff5fd7eb7890f3bf87ec651d46
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 17420 bytes