Malicious PDF — malware analysis report

Static analysis result for SHA-256 240e31c667f53758…

MALICIOUS

PDF

94.5 KB Created: 2021-06-27 22:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4685c20d0b9b5555d956e95d439b33cd SHA-1: 10844c759a65fa50d2528122569b709b9faa37ed SHA-256: 240e31c667f537584126ef9ae156a04f01ec769854a7c482296fe1361fd1c3ec
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pusheng168.com/uploadfiles/20210620221603.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6d10a4b1e4b7114ba8d596af8d5db8b1/zakupinegawuridiziwodu.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccebf8c248f---kezafuravowojatumuxawoko.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/kiguvujegufe.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f1215604f---kigefe.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/s29hidh7b5m8rt4k5vgcq88cg6/43022408205.pdf
    • http://dharmapremipariwar.org/userfiles/file/38051616389.pdf
    • https://luminex.pl/upload/file/vuzufofomuv.pdf
    • http://ytbozhuo.com/upload/file/110810075557.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607327e1459d7---20796553979.pdf
    • http://copy2d.com/ftp/image/file/lemaxel.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec50916452---saxituleforuwubukoxubaxa.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9d58deab306415d8f5c6593a05ed2f48/53473911804.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d92d72c497d7caed29f9d47b22a57bf8/zuzuzusivubigakebuwun.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943a41e590---dulirexitudirujet.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1b11db7c5---22615632861.pdf
    • http://saokienviet.com/uploads/image/files/65032971303.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vpqhva5kp0mfu1eugc2qo3jv6h/16635259333.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06bd12e08---tojesavigemu.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b6c37d4fc---53525951901.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/c72qn34lngmp1qjp5gun6g959v/75544421824.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8mi54sh4a5q62gu8698hf9rj72/59813183670.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8625fa89e3---74579762750.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/87977cf391674e14fdfcf9841ca3fc96/70952687696.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dubious+in+tagalog
    • 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_off00010ec8.bin
c4d6561bf1c6e9bec781341f46cf9f7876a9b7b88654f723c7ef005ecda64709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 10292 bytes
font_01_sfnt_off00012615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 16792 bytes
font_02_sfnt_off00013e27.bin
860a5af97e776f58a2ad49cf950251b0b8a68206857b7fac020fd7b4f4094b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E27 18128 bytes

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