Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc36c3f97e3c765c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 13:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c467cbe5c218a9d1fddf864fdb62070f SHA-1: d5fec5ffb15c1ec7919d4284f228d44142045932 SHA-256: fc36c3f97e3c765cf8edc03bf1a8187a81846e307dbd2079ae0618f065995d88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://bengalroys.com/ckfinder/userfiles/files/wusogejananokukuluda.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hpigv6dr873ig1jb80ip3q4r72/99840709130.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/zazowojekomuda.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/jegadawe.pdfIn PDF document text
    • https://betsin.org/userfiles/files/82739202529.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/besediwulaganoraxulesi.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/futedezovatulokazexe.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/xepujojuxakope.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/lefanilifisiguzerinewi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd29dd492---muzonisemakalawi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc08427a01---6420825616.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/mosevutetedapibop.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf7de5e0d---jusila.pdfIn PDF document text
    • http://machulski.com/public/file/lukugufubatupunenunikir.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/toziji.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/93681849051.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/bifumofanevowisugadu.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210908_085252.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/vinudiwekanogamo.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/pabuviviz.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/sipuwujizesemodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=manga+comic+books+free+downloadPDF link annotation
    • 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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 11032 bytes
SHA-256: 2d08ec824aba1180e0d506c1f84164cb40280c3b2f5599493c7a041eecbd24d0
font_01_sfnt_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 17196 bytes
SHA-256: ccaecad2f36bef66e7fd1d64f2bc6f979c7a76e86d015c8a2bda34e971fb75db
font_02_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1