Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6bad7753e4d53d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 17:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cf12ade0f09d74bbae15f98e2d29ecb SHA-1: 36631f607bbe94d95814d87e98ebceb2129b6230 SHA-256: 8a6bad7753e4d53d3e07a4f2db457d9b330fea4dcf888d3c2461cc86c1da182b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely to lure users into clicking malicious links. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=kapu+surnames+pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/de59gn0kb2ve659l727g8tk9pg/ravakogibobibi.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091341cd9110---66351409534.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c5b76fd8bb4617927678032cb17b8c7e/zuvipebu.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f6de91b443cd8ef2184027d57b8fdc6f/83281346476.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/acqbc8rqlugdk806t7j1dbf0d8/fokebidig.pdf
    • https://pnvvr.ro/userfiles/file/miwevipowizirodopopubez.pdf
    • http://ongxoanhdpe.vn/upload/files/76412543082.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4dda9e917---48539791797.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/jotimonuv.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/wumolasirataxazejopikaze.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/tikigorosajemurivadal.pdf
    • http://agataklimowska.pl/userfiles/file/lanixenakumix.pdf
    • http://caycanh.vn/images/fck/file/fosesupinudu.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qlue28u6vrgh3psfmmf6h6kmnc/lodula.pdf
    • http://sro52.ru/uploads/files/76262615294.pdf
    • https://penal-garazh.ru/files/94841210553.pdf
    • http://sostrevalli.it/userfiles/files/rinumapuwixibudafe.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/tpfkjbbu3hpuhe3vhs5f9vlbj2/79749505419.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/40727726949.pdf
    • https://akapacha.com/userfiles/file/68788920834.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b4021c0691ef4602415be13f57c1aa7f/71352601600.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1b2191210d090066f650b6a9ee28cf5/sevurijowetopijapawiraxu.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f743.bin
6d14d1a7d29dbbae9dddbeb682688d1001e5e77e8f948817a5a0f181fa8ac486
pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 16280 bytes
font_01_sfnt_off00012176.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 16792 bytes