Malicious PDF — malware analysis report

Static analysis result for SHA-256 363553b99101c3c3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 22:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98b2da8b00ea7d28925beceb44976a4a SHA-1: 15f46ebab39db51413c979a8b011781bbe222bf8 SHA-256: 363553b99101c3c352ec0239702508295cee358bfdb0755063793bb5790603e1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter specifically identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://comobrew.com/newsite/images/user_uploads/file/11044643620.pdf In PDF document text
    • https://windsbs.biz/files/file/23054229507.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/juzagomojazix.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ae5atilb4mbjnvmnj8nemchkp1/lugedeguvurakanosuki.pdfIn PDF document text
    • http://matras-devison.com/upload/file/65258575080.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/basof.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/fiwuzewude.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/91034916305.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff49680bc8---74648841600.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/8bbe0871dae7bbab99dbbbfc94956427/77845020976.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7968f4f783---vusexedivenurakuluve.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1f4ef42f975437b7b6afb918dd67f316/34221309276.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/46534724804.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/vopar.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/23607768758.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/55278607419.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/18106449189.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/73715460688.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5ec46e0d63fcf7cf7098a97f4032eabc/51081456700.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/tuwofudo.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/suvafifisu.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34548388938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=oracle+11g+sql+tuning+guide+pdfPDF 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_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 10996 bytes
SHA-256: e137434dc497d0b04effe83a6f2af2df44f8d9423bb31cab744bdcc796f9cd43
font_02_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 17360 bytes
SHA-256: 23525f818911f8e7bd8aca995d8c15ebe2c8720d5e166e95d0e4407211c5b64d