Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec7a1ffef431c56…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 23:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a8978801922f488986f6a3d5651d248 SHA-1: acd89d8fbaa41549b4b5276525fe9790a003fdf3 SHA-256: 3ec7a1ffef431c566239fdc782dd19ad77dfa8d5d528bf7f2b5c504ddb8fab29
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO poisoning. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://manpukulivermore.com/uploads/files/diwixovokejogovi.pdf
    • http://stepasidemedical.com/images/uploads/file/34486832698.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/j3ng5qe5itoh6fqpl6snpfv1ca/40160670274.pdf
    • http://headrepublic.pl/images/files/rapekafuzejejotaraxeba.pdf
    • http://skrn.cz/pic/file/pimupalomiwiku.pdf
    • https://detmers-kontejner.hr/files/tofuzuni.pdf
    • http://acevina.com/webroot/img/files/16168497778.pdf
    • http://drironcat.com/images/file/rivotonev.pdf
    • https://hsse.hssanesteban.cl/files/63177937035.pdf
    • https://sukienmiennam.com/userupload/files/pibon.pdf
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/47954518757.pdf
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/jidukegejojapiduga.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/19152601717.pdf
    • https://rimi.sk/userfiles/file/weved.pdf
    • http://bukharaatlanta.com/sites/default/files/file/5843335075.pdf
    • http://neoclassicalmansions.com/uplds/file/jitasaderuxuwudusofu.pdf
    • https://mmszke.hu/files/file/nofupilum.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/letofokudeko.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee15114616---28207744518.pdf
    • https://sofupingame.com/calisma2/files/uploads/nibajelexupu.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2j9he21btda2l7kqii4h1d5901/42586344586.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/e25o473ph95vvlm4n093hgs4t6/67422553649.pdf
    • https://perfumes.dropship-tracking.com/userfiles/files/lidokix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wallpaper+nature+hd+download+for+android+mobile
    • 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_off0000bb64.bin
cef7895adc8513e51f2d0f1d831854d0e4ff3aca9ca58dbb6e61ac595e667faa
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB64 10912 bytes
font_01_sfnt_off0000d435.bin
7fe3f6e00c895ee07a2ecd5cf9bfa9313b4b0b5d940bd64506cc792b920397ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 15352 bytes
font_02_sfnt_off0000fafd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 16792 bytes