Malicious PDF — malware analysis report

Static analysis result for SHA-256 4495a4d0f1a86f8b…

MALICIOUS

PDF

76.9 KB Created: 2021-06-25 16:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e62c2d8a381a0a97031fd45a6b95168 SHA-1: 6b7f792edd5e430b48228a67a2435a1078bfc5e9 SHA-256: 4495a4d0f1a86f8b5d7aea92a0d1b9af831b92a8644eaf8a919fd88af53c34a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stark-tools.ru/images/uploaded/netonux.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef3e6f851---48429972838.pdf
    • http://megat.pl/uploaded/fck_files/file/futubaxapoxizinexuniwi.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eefa4ec911c3c311e503a5a8ef176383/79221381038.pdf
    • http://heninrealty.com/userfiles/files/21846611354.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db10a460fe---77335818928.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bha95p14egkckonakfa1ajte0/fukavow.pdf
    • http://robalton.es/Albums/images/file///48454087618.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/7ufa6s7r0kusvi5ote4vj2saa1/48727505303.pdf
    • http://kibbkw.com/uploads/file/22901529933.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ff19959f4100d44541a7c1a08ef8cece/77377340014.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f5b1bb231d6a132da88793884e7a65dd/84806556681.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e45020e2cf83157399ada08b730c95b1/xebifepositilol.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/51f31a16974f0bbe9f3f758a6a49ba0d/nazawilop.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d2e0e225c7dc9fa7342e6936cdf2750c/mivokejerodem.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63a8b9435---pejenaxubunewefir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=morning+star+publications+merchant+of+venice+workbook+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b358.bin
bb33fec7cb165b793cc2a2bf7d813015f834a09007e1724b00445f54283933cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB358 16148 bytes
font_01_sfnt_off0000dd0e.bin
f686f24f4314ac1d097a7f51a3234ac066753f2cea2a9146623eb83cda1c691d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 11404 bytes
font_02_sfnt_off0000f7a3.bin
cf48b691868a259c9a47f330077ef157433a70b9d03653b9765cd482506ba2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 16300 bytes
font_03_sfnt_off00010d9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16792 bytes

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