Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c469b3afe822c6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 11:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad5c9994c32e506efb658d945086dc7c SHA-1: b0bd8322e5b651443f7071d4d7794ecb1348dbc9 SHA-256: 56c469b3afe822c6324c459dead09892e4c0f205934b853063f189620ad4d764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings clearly point to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://machinesupplier.cn/data/product/file/2021916_11117_814.pdf In PDF document text
    • http://flightshop.jp/images/blog/file/12351340592.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/rags6ik8hte6p9bl7utqibcs56/50044576308.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/ketebemomeropage.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c308107a23---tifuk.pdfIn PDF document text
    • http://web5gstore.com/Files/files/wofatomezosevaziwuvovav.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/99017588756.pdfIn PDF document text
    • http://ladna.pl/user_images/file/kasidunexozo.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/44951432344.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/sudabigodozilatowil.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cbc704dab---siwibakupirufataxide.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/vozodoxudep.pdfIn PDF document text
    • http://pactolous.hu/upload/file/xonomo.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/dilulasisomememu.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/ferewuso.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/bemebilokafu.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091312111970554.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/dezudopetububonerer.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c842a190ba293396187f2dd37b41709f/85471395692.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7efc59811---gezakofetivugevepa.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/makiposofuwosolofozup.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/sipowarej.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/11199225309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cara+install+android+sdk+platform+toolsPDF 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_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 18000 bytes
SHA-256: 2fd993a6726ae84ca835d09236eaf8423b4c16dd22e00e3134aacb9e88d17734
font_01_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 10652 bytes
SHA-256: ad90e096f78ab3d9c0a2d4a63f0f5b3ba62dac78969146ab9e02cc5bee1f8c43
font_02_sfnt_off0001232e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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