Malicious PDF — malware analysis report

Static analysis result for SHA-256 d735a1a7f094eb87…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 09:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ac9473d631ca71756f1b30aba4ecb43 SHA-1: ef53e758b4199ed79808e5f38a8e05dad06a8e5b SHA-256: d735a1a7f094eb87c601991896695e66c82fdf13e5b7bc58ad882779afa8a97b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gt-outillages.fr/ressource/site-image/files/52834280004.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/hvjgli8gr5c1r2pamhlukefcth/lodisipodomifufat.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/47479055590.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/4710592792.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/rotegofutafuferu.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/naterub.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/307c4a363d3a9eb6bc26674448fe19d1/8830152721.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/59966278575.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd696d467c---41186467118.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/62979458407.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a00256ce878---foxenopupevelugevamuzifaj.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/wiguw.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f174209e---39565135537.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3dc77035---lalibuvimoxiluwiv.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071472ddee97---76333279378.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/77958248622.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/pezomulekozagirufubi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xalokixubirepeleduvelaze.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245ffc9e6a---ronefazuzekeviwarolug.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/53499955858.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210828031155.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/gezupijapero.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/sozetuvararopexabe.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/dbd3050e2dd243bd9e3b9fa3b8921c2c/67779931021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=seeley%27s+anatomy+and+physiology+11th+edition+pdf+downloadPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/jezuj.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_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 11204 bytes
SHA-256: 57a754ac289c272a3dfc63de30586a083df341ef639304331d83162f2275fa48
font_01_sfnt_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 17112 bytes
SHA-256: 50cd51cd268589765e39c5e4d8c44e58daea146795feb3990c62dd9fdfd20413
font_02_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1