Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f10bd8743f096d…

MALICIOUS

PDF

87.1 KB Created: 2021-07-14 00:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab6976489f61bc79f52f4f5033d2bf5a SHA-1: a7b248f247b3b2f5fb785ed5dd4f3f2c27604b08 SHA-256: 98f10bd8743f096d8a11504ce3baadc0eabcec5ab4a432176c6ec3f4e311804c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload storage locations. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sarljarry.fr/userfiles/file/winiz.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/456332472bad20d15c750d6435236a57/pakosemuzuraxigodu.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49dd63f91---nupinopubeze.pdf
    • https://foundryindia.org/userfiles/file/retexirupukagopesevagix.pdf
    • https://infiniteprospects.com/FCKeditor/file/vujamafinelipomonabuwose.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160875078d1075---kigolakeparosavibif.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/fofisuzikoxazek.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6f87e796d9aba97a998d466f4b873d47/jawuvagoteg.pdf
    • https://kitapkapla.com/upload/ckfinder/files/jiwutedenetija.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/2e86dc64646164edfa4e1ce1979943f2/foguwikupozaxejabaxozupev.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084310f75870---57614587727.pdf
    • http://yachtandgulet.com/userfiles/file/tunixepezix.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1281796e0b1a576f7bcdce83bef4617d/wedadaxufigiw.pdf
    • http://hysansam.com/fckeditor/userfiles/image/tumudomugipesuvafeninapo.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8q0bracth8vpbd7p4nde0q6go1/wutanatanona.pdf
    • https://oddluzanie.net/userfiles/file/gejalofomaxunapinog.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ace9b8575---zuxotabitaj.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/32cd171ccc0d334c3b2e50ddbf389816/74042685913.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/132d99024c0457cd77ae0a593d3518df/29248643241.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=easy+game+level+3
    • 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_off0000f43c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 16792 bytes
font_01_sfnt_off00010c53.bin
cb6bed2676636e129380f18d9fe2bf97ba6cdf4d76dffff00b7530703adbe442
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 10272 bytes
font_02_sfnt_off00012385.bin
aedec13529aa0d610c1767629f8b12dd4e9d45b8ea04b5e1b34084d4836b6a88
pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16960 bytes