Malicious PDF — malware analysis report

Static analysis result for SHA-256 231d77cd6329a9c6…

MALICIOUS

PDF

94.5 KB Created: 2021-06-27 00:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7858c2aa2ff6c73c547a42a8cdc8e0c3 SHA-1: da94ac3bc4b584695c2f7c1593eb4e58b3c6bb10 SHA-256: 231d77cd6329a9c61d470880ae2bf9e01dd2283dc1593d163911226ea48e5953
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4707b4752281ecf388a454557993827c/lixikogod.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/85c460d221df7d4f4e55648b96775814/78667168030.pdf
    • http://xn--80aawifdlfr.xn--p1ai/ckfinder/userfiles/files/63656511059.pdf
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/bupatejenevoxik.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160924e2435e70---99880001779.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/6e0a9726ad654038de3a6dd8a0220baa/makuwonagakitoloxuk.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/o6g4p9ft6uhlmcsq3n0npsefbd/74638894654.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173c1633cb---tofabex.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28147559f4---15083729399.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5df53c906fb265087af9a2d970d71eda/23585872413.pdf
    • https://sindonis.com/userfiles/file/8384246061.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/524651171e3ef7129df9eb17c9d2bbbf/97537182352.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/942tlie8dhmb302bp80rb1cuuu/11612401847.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609448fc32019---mutifawugus.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fedd6e3d3c---pekoniguresasozisub.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b69368631---dubujomuju.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210623193029.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8aede8cf---76474755737.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d044bb0e18c---15370862299.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4v5h6bkfrdud4fsr6tpskssuv7/jibuwe.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160985998d9e9c---4177258221.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f88b6494b---71002134954.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3aa06b94---77743647362.pdf
    • http://esthebel.de/userfiles/file/75820906648.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=albeit+meaning+and+usage
    • 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_off0000f344.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 16060 bytes
font_01_sfnt_off00010858.bin
6ddc856dfb2025c110a2e9d22ad8e71b1a354aa531ecc45f08600b7192e3c8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 10592 bytes
font_02_sfnt_off00012046.bin
70fd2debaeb2f4e4f61fab49a2b9dd5408b40a05743b20f69b205a1673fa891c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 19412 bytes
font_03_sfnt_off000152ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152AE 16792 bytes

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