Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb163a0cf4bcc2a2…

MALICIOUS

PDF

97.0 KB Created: 2021-06-29 13:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7804f9dfcc7265db9cf74adc178a2a34 SHA-1: 6752c88f6d7b2e211695812c11c9f40f8cc13808 SHA-256: eb163a0cf4bcc2a2c18e5e267a21324a93a453c98870a455685399be2d879976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=standard+deviation+questions+and+answers+pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4e490c44---17605326244.pdf
    • https://baongochoa.com/upload/file/70462000124.pdf
    • https://cowichanseniors.ca/userfiles/file/rulevagudi.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bema698u4d53kd3hf24rmj3rsv/7922823196.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6319efd1c---nupus.pdf
    • https://accuratesearch.com/userfiles/file/xidojufogabi.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9be7cdf9c5552acd73672cefd6afa51a/29767121179.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a37a45e6e---pileko.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/32092487674.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e573e9ce5e---66980646036.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i7rch3308ib56higvltamf50p3/nuviwamegevuri.pdf
    • https://palcev.ru/userfiles/file/vunolazaxikujasenipigo.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fc2c6e46---vinesoluja.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa67c7f871---19078478182.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/89e666c1040b203d0304b408f33a70b6/pidulijozedogon.pdf
    • http://zrdb-drogbud.pl/Upload/file/27255525431.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3bd6da9bc---2214428690.pdf
    • http://basaritarim.net/admin/editor_resim/file/94659260351.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3df448cc5---20815960359.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c899aab8093---newibibomunelaxibosu.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3dd1f46c87d19e4d321fef53e144dd83/88261449734.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tp17nbnjtsb8s5q7tn5khn6570/kivukadibilunaw.pdf
    • 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_off00011676.bin
f5279ae3d222a24eb74c6d6e5d3023d4f03d9ebbe0d73eb5c486b3ca71d205eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 17716 bytes
font_01_sfnt_off00014511.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14511 16792 bytes
font_02_sfnt_off00015d28.bin
321204ade4f9a92a6bc9f635f6e6e19c3dd29e35b6d0b577cd452d80e3454321
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D28 10920 bytes