Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6748794ba9c4057…

MALICIOUS

PDF

88.8 KB Created: 2021-07-13 15:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ba878f2e3cf9cbcbdbaaea4604ba03d SHA-1: cdd64230f401717dc5e7b67103672d38dfe8df10 SHA-256: c6748794ba9c4057781fa506633d7bff4bb83effc4abd28afd06c01237c2f845
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other domains, likely to host phishing content or further malware. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d39kea9dpt4107ve8c5cb8hr47/6182667748.pdf
    • https://susta.vn/userfiles/file/bujovoj.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e03646bc1dc26f863f884895e7bc1529/ladupuvapopine.pdf
    • http://blueyee.com/upload/file/151511227642.pdf
    • http://hawks79.com/clients/85064/File/93362286073.pdf
    • https://kisikana.hr/userfiles/file/16057654735.pdf
    • http://kulturazebrak.cz/userfiles/dizaluwomururugefavin.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b98711a39112f90478352011c1b2c2b1/derixuxogezumobegiguxi.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b46647fb6---wozudowalepubi.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b020f682829---66021443588.pdf
    • https://bmw-zona.ru/uploads/file/87264472951.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/9426693278.pdf
    • http://alliance-ltd.com/userfiles/42123123404.pdf
    • http://vestmorecapital.com/images/epost/10338940457.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a2bec174---73234827674.pdf
    • http://drukarnia-warszawa.pl/pliki/file/modepugefelomugajunigax.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0d5aa79de6e61fbb0fda2216cc03afa0/dimuwijari.pdf
    • http://bmsorganica.com/userfiles/file/36061982690.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a09aeb5036d---lajudakunaje.pdf
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/rorizawolojiz.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/imch5bjcnkhk9pp792vhnuu50c/nategatilemer.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/vunem.pdf
    • http://mediedil.eu/userfiles/files/xezexopojuminavuni.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882862eb31---zuxewajuzajumowuno.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f690285072---savobikawubozuv.pdf
    • https://producedepot.us/userfiles/files/mobafaramujamawikubebova.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=signs+of+an+under+active+thyroid
    • 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_off0000f84b.bin
d08ff3bc0d2d594f18a933c0eab4127014c224faa73d69e2f0f6a8491f294740
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 11064 bytes
font_01_sfnt_off000111d9.bin
0e32fd8049b4f4143387d089682eba4bc3f55700d036725a573cbe63c084d6e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16656 bytes
font_02_sfnt_off00013d5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5B 16792 bytes