Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e4dfae5c06dca1…

MALICIOUS

PDF

92.3 KB Created: 2021-08-01 19:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3777123ed6f96d0faf34bade957c3b13 SHA-1: 612f7af5f48b6dba7603d4b79f6dbea4e7a7ed37 SHA-256: d9e4dfae5c06dca1a2ffcdc3dd039f4e43a66c3c012b1b2357b2620173b34843
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate this PDF is malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and embedded URLs are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://krisoc.ru/uplcv?utm_term=animal+farm+analysis+pdf PDF link annotation
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e5b8260a60be3d4ac38cf9d9d093afe0/xolivaxuxojugebekupegorud.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95cc1cc549---bawutozeranokosevu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797bfd668c4---povirigobinasovexiki.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/sudoje.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/67790367677.pdfIn PDF document text
    • http://huiking.cn/uploads/file/141748354774.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ec2svucb9kdpraln430g4g0k85/97157189216.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/pewexuxuvagemojasaxok.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/77134480756.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871568f3750---39782900023.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bb0d33c60620d3698464ff7f94e07eb0/vafodolaluwofitokirejazu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608694a94e82b---vazifenatobugape.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/0e7leoh5qihmb7q5p3sngh2fe2/dorojusanekinuwupazamuvu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b4c25267a---29655895808.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5eea8e05f---80338208029.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a018f8dcd88---74919979245.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/885eab44a84ce554458d996b0afadd28/44013334803.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609824dd55dec---wixivib.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e5cb7f30f01350c89a857b89991eeec1/7360176012.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/suxituwido.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/memugimidosoz.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e6ad566d1---6982982920.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dbdd9d0383736313bb30cd1e279ad439/13867809730.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/rurodivos.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3ab82c135622d5a87ce5fa6904ced241/zivufatebugasezavarogu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/75361c815ad23be0bb8c3ccadfeb8955/gabozogiwagafeviduporov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 16796 bytes
SHA-256: 162980f0569f17f474d58f9bce00336a7ed9424d011a71747f4f28941e3e4183
font_01_sfnt_off00013378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8F 10404 bytes
SHA-256: 77b85c0a6537f434b86208238389c59e02e6e53bf5054de993b591326172df5a

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