Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67947db6f551557…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 12:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 135435029cabc25c95e2309725995e6b SHA-1: eb885733a8b53e39d4812d7f19fa838c9f3489ee SHA-256: d67947db6f5515576e043dad5dc6f1a0786dfa4e531fbe8d4f42f759db186a8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://flixgolf.com/ckeditor/ckfinder/userfiles/files/9492421794.pdf
    • https://srsatta.com/ckfinder/userfiles/files/jipimiximapefef.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/65414353946.pdf
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/buvifaj.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/64405333661.pdf
    • https://groupekheidri.com/ckfinder/userfiles/files/12044572708.pdf
    • http://i-tos.com/userData/board/file/kixibo.pdf
    • http://artvideo74.ru/upfiles/files/gakaxo.pdf
    • http://tnslib.net/userfiles/files/54318374580.pdf
    • http://automyjka.pl/automyjka.pl/userfiles/file/48054738100.pdf
    • https://somos.co/dleyes/admin/fotos/file/87127709243.pdf
    • http://bkmarine.net/ckfinder/userfiles/files/1631474329.pdf
    • http://vamaconsulting.sk/userfiles/file/67025864340.pdf
    • http://braciszewska-klimek.pl/fck_files/file/99953609311.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0dc9ad5b8b56aa44214345f1cc0453d7/32951985319.pdf
    • https://oddluzanie.net/userfiles/file/59129465125.pdf
    • http://f-kcc.jp/user_data/userfiles/files/badoxuleb.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd0b5cea3---tanifugezonekumasudedo.pdf
    • http://thingsantiquesla.com/userfiles/files/14031359912.pdf
    • https://veaodaibrahma.com/uploads/image/files/1919682785.pdf
    • http://jsdarvin.com/files/xomezabup.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/44282810764.pdf
    • http://mweb.cz/images/file/sazovotinefuwum.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8uhb4l9v5uuo2eubrm8gju8mg6/rarodawonemefuregaxex.pdf
    • http://pietrek.com/MARCUS/files/file/reretujov.pdf
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210909_064905.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=real+minecraft+apk
    • 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_off0000d72f.bin
f5416992cd1cadc816062c64edaa4976ea94535f8c4d70201ccdb36b6dd17b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 17192 bytes
font_01_sfnt_off000103b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 16792 bytes
font_02_sfnt_off00011bc8.bin
5bd48fdcabbc4dc6ad1ddf9c28c1c451e1a2ec778d487c27675e9f189e051899
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 10488 bytes