Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc37d703b0e64723…

MALICIOUS

PDF

81.9 KB Created: 2021-07-20 04:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6373d513f53fecfbacf8508efc385080 SHA-1: 9305f11532fd6d5d213876a5cd3e79bf2d61839b SHA-256: cc37d703b0e64723dd1adcd203f7a7b29c1246f25cc2999cee3867c26ea2c6d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains embedded URLs, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f268126634---24362674614.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/flo1hv7sr3u3re1gsuo7p75cvg/rolijefefisogo.pdf
    • https://rmp-traueranzeigen.de/cms/files/87580884706.pdf
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/femubenilimesejinopap.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16b559749e---joxawetozafejelunolo.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a010f8b6d9ff7dd9c46c58fbbb05295c/20992070302.pdf
    • http://greatnice.club/updatefiles/file/59196714397.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0vsvmoe5pcd98tchfu1omlr8a4/50516682504.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdac4e4b8---33359315409.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f8b59af0cc053fae6210542b17d65a1e/mokexol.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f45f02a9---56041539108.pdf
    • http://thunderstar.cn/userfiles/file/20210501060517534393097.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39b8493cf1b024d8c254492a1bc58f2a/nivutud.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/dd66b8dbfcf56a9f4e3b8058fd6ed5af/86606409564.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/14f92baf6ca75d2fcbc382d372c9a849/lexoniwomoraret.pdf
    • https://restavracia02.com/userfiles/file/jexavukuxepika.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b9e1ce27---15275875205.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081775740056---23774096539.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38c22a983---buvopevuxarawide.pdf
    • http://cipetbhopal.com/webimg/files/37145719387.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v2q2hn8cq8aiosgf5mdhrjbjqk/makimunajaxafinaforajuxi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cn57v09u12h1us7lfdjmiv4qbt/8085542869.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=aud+to+yuan
    • 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_off0000d78b.bin
25f153bab7c6b441bf0af0828d3e3272340631574bb0ddf5121e9364682dc2c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 1764 bytes
font_01_sfnt_off0000dfe0.bin
9db5095877091f5e2904a5bfff7f2bc43d56dd3b809196642f41d8eeccc54550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 16836 bytes
font_02_sfnt_off00010bf7.bin
79967c8894c5f39b8f9eb2d474e9e7dd5d345ceb41c1da0a00ecc7aa36c0d7db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 9900 bytes
font_03_sfnt_off000121f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 16792 bytes

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