Malicious PDF — malware analysis report

Static analysis result for SHA-256 0975c9319a27899f…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 08:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecc439e5000e307601b170056ebc4eca SHA-1: 248801206523185088c355c21bee2b6d8b890d41 SHA-256: 0975c9319a27899fc51d4d5bf3410decb3e8fffec9de6ccbc45ad74d4df2e4ac
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it is designed to lead users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fultoys.com/userfiles/16944966129.pdf
    • http://sewakendragroup.com/userfiles/file/rujozadakejotewejig.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc9743592---wonaw.pdf
    • http://blueyee.com/upload/file/021910128181.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7adbfe08a1dc8721a638d7c6a746c63e/xenedepibivopobu.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/ff2dae5a0c9e9a02a6f231cbf102325d/rawokevexexi.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2a3837d472b93adc51170a5483afcf51/kujejifururivepadigajo.pdf
    • https://meesens.be/KrMee/Tekstverwerker/fekubevilufigolige.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cdf65b276---37479607109.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/28082194325.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724c8702194---15421822193.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/bagaduxijanepovuxideroz.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaefa13ffd---68245158720.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/186218a20337b57f5946245888ec9a0b/rirumiwet.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1seji41p05e640ffv90jaaqiu2/52529789942.pdf
    • http://antoniolescio.net/userfiles/files/manixutenoveja.pdf
    • http://trips-in.com/ckupload/files/32159363761.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a421b5e7fd---85227462170.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nissan+juke+nismo+rs+manual+for+sale
    • 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_off0000c23f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC23F 16792 bytes
font_01_sfnt_off0000da51.bin
2e31261574145839aab4596e911f4a9698682734905fbfa227fc02c0b866ea90
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 17672 bytes
font_02_sfnt_off00010819.bin
1f0def56a9bb490555fb9237aa679787147d20ae4dbae34ff1ddb354e68d1ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 10576 bytes