Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c4a45a510aeb5e…

MALICIOUS

PDF

82.0 KB Created: 2021-06-26 12:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: feda0c33a3ea963492c7d1d10c7ab2f8 SHA-1: 95d58ecd520a902a254e71169338a7e06738be09 SHA-256: 98c4a45a510aeb5ef5d34e088415e257d95cb988490faf38562c5403fc2cea3c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2a26fa8a---xutidujeb.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7h8p4qstkmhf6ha8hhju18l7s3/66074526463.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6671db86cf---niwenenozoxa.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a628671eada---nodadomutididetukezag.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160883fe0a1b3d---winuxiwinu.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0dca6ffe---75127691946.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c964ec80---tabex.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/67bc232ff40b93e524e7adabffe4d18d/16488981025.pdf
    • https://alternativecarrepair.com/userfiles/file/47807383336.pdf
    • http://emannsltd.com/userfiles/varojutavozinojozegisafa.pdf
    • http://biatlonbreza.sk/editorfiles/files/32978461263.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160996a02ac0fa---29898403255.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f7a660551ff0b2cf78bc6203f033c470/37716544.pdf
    • https://coluer.ir/documents/file/65546495242.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d981022114---11916551568.pdf
    • http://www.allatpatikapecs.hu/images/file/forejilujusevajad.pdf
    • http://scales-center.com/shop/fck_file/file/68779209609.pdf
    • https://casabresciani.it/uploads/file/240685729.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607281a0878fa---divanuzelotufixunagu.pdf
    • https://memoservicesrl.it/file/wokebesasezurep.pdf
    • https://abe-rdc.com/userfiles/file/46781985248.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/7kklh4q89rlq7avj96qbhujab2/66997478211.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160769f44bd74e---tedido.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=science+notes+for+ctet+paper+2
    • 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_off0000c883.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 16092 bytes
font_01_sfnt_off0000ddc4.bin
37832ab34513ebc262b56c2e1f984f6c8f6bd2e7a8af012281000998de5c8bfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 15988 bytes
font_02_sfnt_off00010730.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 16792 bytes
font_03_sfnt_off00011f47.bin
403dbace9218098027a73c0a450afcd1891bf234ae61d46fab7b62ec089f86dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 10620 bytes

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