Malicious PDF — malware analysis report

Static analysis result for SHA-256 645803ef924262a4…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 16:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0058aa8236e0f749a8f38c2e50500a2b SHA-1: fb5f99a8c0adebbc2b90582dab78242fe0ac89b3 SHA-256: 645803ef924262a49efa1f6a47e97a3076be00f94a960c06e7773bd618b91494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=framing+analysis+an+approach+to+news+discourse+pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160771fba5925a---pudazukofer.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b503f7b511a---kijevod.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a70c81251ca98dacefdd357566726c42/nukakarubole.pdf
    • https://an-professional.ru/img/files/file/28228819628.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b939751be---47316570735.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/54mken32jrgph07pnu7khnsk0c/68070372913.pdf
    • http://jjkxmy.com/upload/files/202106260753437145.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c7afc4c0cf2c7fdfd2e89c6a70465964/zofedadikirofu.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8678066eaa---bomelo.pdf
    • https://bamor.org/userfiles/file/nuguxabuvukopixaruz.pdf
    • http://classicalgardenornaments.com/uplds/file/58891688116.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609046d67fecd---gezofivizejanemipapenub.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce8eb237c---zufumipuzajutizogu.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc4777aaa---24359565590.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9983013eb3f971e0db1f8ecfe8d045bd/kamogevapinogugadefile.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2df69ea4cf74a7cb6e48835605868d4f/62140854811.pdf
    • http://briarcliff68.com/clients/71184/File/8120986658.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2360c220---xodofofolurofa.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7de9bf833070fca7a52f5929cba2fd84/35040252566.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210621_ED64B48C44FED7D8.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/divamo.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/osddqita2ero77fbi621ia51ra/loguzaku.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/fixefalikid.pdf
    • 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_off0000df47.bin
ce24b20ca97196d0dbf39d090bb33e95abfea3770b2a3c9a15881e9cebad8aa7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 18148 bytes
font_01_sfnt_off00010d41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D41 16792 bytes
font_02_sfnt_off00012558.bin
7a38726b3f388ce54229019fcdaed4b261d7ab42d40f851a4b65101e574ea7a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 11344 bytes