Malicious PDF — malware analysis report

Static analysis result for SHA-256 974adeb4763d4241…

MALICIOUS

PDF

76.9 KB Created: 2021-07-15 11:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc76ea340256fad45d519bc9e693aeb7 SHA-1: 35e2d7b8329a95c44f663dc49d74bf6c24b2713f SHA-256: 974adeb4763d4241a7cfae837f0d0f6d57b6ad87b8af41fee6b1e98c413bbca0
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The document body is unreadable, but the heuristic findings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bwawarszawa.pl/upload/file/gasivinulakufik.pdf
    • http://bsa.by/ckfinder/userfiles/files/piponaxutos.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/fetilijipubovop.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8f9986e64331eb524407f5dbc2c24d59/nefigaguv.pdf
    • http://lsneotek.com/ckupload/files/12273636889.pdf
    • http://mclarenquartz.in/ci/userfiles/files/givovitipizezovejaj.pdf
    • http://highendschmiede.de/highendfiles/file/63524065899.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e72316d91---fotadezat.pdf
    • https://onlinendttraining.net/files/32413028113.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4a3b1c7495aef2564bbc492b88d31b86/90705715470.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/nha1he094gr2ipbpi0n6f0n50q/82792348432.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48e74ef95---7629765260.pdf
    • http://unicorn-furnitures.com/d/files/22047145165.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb6a56674---74987555160.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/da2a0c6db9a5b8c95fcf243c59c67473/24225205026.pdf
    • http://osc-pribor.ru/products_pictures/file/pijukuvesodamexudiraloz.pdf
    • https://eliteplacementagency.com/uploads/files/64164963909.pdf
    • https://burlingame.com/wysiwygfiles/file/4606807490.pdf
    • http://cgl.lu/userfiles/files/gevafuwibejobot.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/muxusubifoxewinireluj.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072db9705ecf---94860579144.pdf
    • http://gocep.org/data/userfiles/files/newoxezoda.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f891709ba3---xevavikojaliporogazodeso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=i+know+my+colors+free+printable
    • 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_off0000c9e8.bin
e9a639a2eeeba9fe7d19941be46f1904059fcc88e2f92c9469d3dbd0e6a781db
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E8 11024 bytes
font_01_sfnt_off0000e363.bin
eb7a075ade7f14cd1cae745b55bb3b5799520711250e059224844d5e2c2e72a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 16548 bytes
font_02_sfnt_off00010e36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16792 bytes