Malicious PDF — malware analysis report

Static analysis result for SHA-256 132509af7f6f6a9e…

MALICIOUS

PDF

97.7 KB Created: 2021-09-01 02:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7070602343fd110d230e0f79cd86780f SHA-1: 9147304b60711ef2e86bacbefca4feb078a11d67 SHA-256: 132509af7f6f6a9e7fabc2867614724dc720c92faaf45bf48ef3cc051bfc028e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which are identified as compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/952e99d8d1d45cf1a066cf79a620eb30/famasopuguzu.pdf In PDF document text
    • http://medicaldistri.com/ckfinder_files/files/38197856250.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/42098124425.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/pakapenuputipunit.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1800b367---vavorix.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d96193c7609e87ebdf41c79a77d5808c/fagaz.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/30337297672.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fcdc443b0---vurobalizizizajitoxowo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f6abe25a---sariruwopotudakipudenamun.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/duxefa.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/83445539013.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/pujabekaxigamufozidux.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/guduzeweroja.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/1ebd2me2lb0mb8hqqaoa7bpl82/bezitevowarir.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/powuzetajadifatipa.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/pusosozotufokalivit.pdfIn PDF document text
    • http://teifsepahan.com/files/file/jasadejepatopepogatukikab.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/bafufofupex.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/zedofeledekadoxugij.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/rapumo.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/32296033374.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/47286491753.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611414c38b2fc---14934459076.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/95886992194.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/vijojewowojosikeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=flashlight+cause+and+effect+answer+keyPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/sukufuxitu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 17644 bytes
SHA-256: 062036ebf813c5ad7d23a2f77399ab569b168ef2e033a626b86284f6522d206f
font_01_sfnt_off0001463c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E53 11004 bytes
SHA-256: ab41fd9f0954333b88c4d8823638299b1b7a912d5f3030e074884288def368fb