Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2d4e4805e59355…

MALICIOUS

PDF

89.7 KB Created: 2021-07-22 00:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72ea5447a5640a67039b524f02144264 SHA-1: 3a688c246b4135c4f8f78684a35b0cb1529be1ce SHA-256: bc2d4e4805e59355e0e7ecb16c5c1c53f3fe13e1bbccbdee21cbb85aa1edcf1b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The primary purpose appears to be directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://keralatemples.info/ckfinder/userfiles/files/gubetumepeva.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c9a6db50---72587641237.pdf
    • http://aldo-ins.com/userfiles/file/dugujetunamowukozuvixiso.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/35a28b3c1daad940c65edba66d07e4be/51344878938.pdf
    • https://conberraquera.com/aym_image/files/61429597041.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9043dbe6f---21134372000.pdf
    • https://autotrans911.com/thread/admin/uploads/file/tadatavebevikewakoniwewa.pdf
    • https://adikkeempat.com/contents//files/kifiroke.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/vemeri.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d79f5b1bc8fb4324d6287f9125f3691e/24331402486.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cb9143e91e380d6e7e9ca9449e567e37/62170699662.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0501b58f3---wudapumedigunefon.pdf
    • http://geoplan.su/userfiles/file/nefuviwiwadel.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089201a2436e---8082187607.pdf
    • http://sartoriaventurini.com/userfiles/files/xuvuvuputuxesofopeziw.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f6d254a6d---45711844711.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607288fb50802---57983236604.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5e8877fdb3a3c6589755151490d0e000/42010811148.pdf
    • http://bungefamily.com/clients/5233/File/44193699375.pdf
    • http://chatfieldfarms101.com/userimages/banumapasibowofevokijeb.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a7f78ce797faa71b0f519e37bf0748bd/woxujoniv.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d590f7aa85---12517097729.pdf
    • https://brahmagnanam.org/fck_uploads/file/9124259388.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/dofaxumetavesazowinizu.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/96929810315.pdf
    • https://topclassgreenery.nl/images/file/zexobenop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sin+city+the+hard+goodbye+read+online
    • 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_off0000fb8f.bin
e3df1de6d86a83c3731971df08b8437c78a596898de775aa3a02d9ebe031702b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 16892 bytes
font_01_sfnt_off00012784.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 16792 bytes
font_02_sfnt_off00013f9b.bin
0efd50d21360fe0850097fa892904f1584739cda809b1f25271fd8ce46b3b006
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9B 10808 bytes