Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4318fe7ddbc8c24…

MALICIOUS

PDF

84.9 KB Created: 2021-07-19 07:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f89c769127682a16019af68546fdccf SHA-1: 8abb1172e64fee149e4c06dd1e1811f0a74ac744 SHA-256: c4318fe7ddbc8c24941692077cd484ab4d87175def476f69fef575f4e410ecad
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iamsong.vn/uploads/files/vesapidisexoxowo.pdf
    • http://gleneaglehoa.org/images/file/roluvonodojasa.pdf
    • http://trimblehighalumni.com/clients/84492/File/21215143427.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b2tjb67rjhulfqduiu749nnabr/22934501119.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dfe9101b50634625b242805e0dd5388c/62799787913.pdf
    • http://syuncyoku.jp/upload/file/77125444558.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608084e849904---51993696983.pdf
    • https://akapacha.com/userfiles/file/27257096707.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b223a80eb6---22183466229.pdf
    • http://cyuanmei.com/userfiles/file/kiranipimaxitarexukonezuw.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ei4d6n05pc7l5v6t52lsmpls4m/26548652474.pdf
    • http://ks4073.com/file_media/file_image/file/24390678364.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/eaf47e6e3d2576f3a2c360e3c48adda6/bafiwavar.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080384581b7f---vilamolegig.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/f73ml971qv2nrfupcq4soh7a0u/47337757803.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe5fd569a9---jagoruxomi.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ibh7b1iirka0cv22rqhs3eoe9d/kasamone.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a21f202dab---xitumipimef.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/dofaxejeligokobi.pdf
    • http://allnatureint.com/userfiles/file/jirufaresu.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/69d61622ba2e2abd96260bbaf04e6bef/61942792838.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee9d2ae6d---moluvoxusagexivatelatadin.pdf
    • http://mindentudor.hu/userfiles/file/71024696780.pdf
    • https://psychologgia.pl/Upload/file/mebivesifazamumubivo.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6c0888c7df5dfe16407986cc472a0eda/watenozibofazefebi.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdad6381d10---53866061994.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=continuous+hand+shaking
    • 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_off0000ebe9.bin
02c14d7218f3794533cf9779b1e60a9d9c8e1ae3a59caa3bbedef6950dcdc266
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10472 bytes
font_01_sfnt_off00010376.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 16792 bytes
font_02_sfnt_off00011b88.bin
559985de74f657e446f2cb461d7a392edc7c6f158079e0b3ad0afdf2fe808c2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 16428 bytes