Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf3c4dfac711021…

MALICIOUS

PDF

109.2 KB Created: 2021-06-29 07:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b42d1400787bdb26e3369d48ddb39a9 SHA-1: 0787f3b871bda9b416ad139f358e56c4b5eca149 SHA-256: bbf3c4dfac711021b8c79336563d3fe443d24f89b23a203312a528a6fb463c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm hosted on compromised WordPress sites. The embedded URLs, such as http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b75426c8dcc---58150711757.pdf, are likely used to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4997e02dfa---dumokonaxixulononujokovij.pdf In PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/em2g0fvdsm424liceikq3nc1a5/99739064197.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f2555957e3393902cb0c318a1ec6e34f/9391340039.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/vemesikitajibixuke.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c6ac07f8---bofigiwi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b75426c8dcc---58150711757.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/41118699609.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61e5cbeba3---1217501432.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0fc927c9---35960163125.pdfIn PDF document text
    • https://ikansambel.com/contents//files/36547844801.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607461f7b53cd---zipoxerefemunimijigokuv.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/bebafuvofor.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/1eg1kb49sdvdca0diih6vr6615/96071301368.pdfIn PDF document text
    • http://atek-ent.com/upload/file/dixefiputapusoga.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210627082841_204o3a.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/60219942878.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f667ee3932---56796087966.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9cc10c78000c5df8f01e7e36fe1122d3/93252493917.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9paeiajah5t39mih6cko7pn6k5/jajobonarazevuzusizojo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jffbd318r74btnuqvrh29j8d10/51041879528.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/7351f4f3160a6c7007792a400924379d/33573147394.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/49605468580.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf6922917---mofibelamav.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/69001084182.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a5311f9b6---melimejologuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=two+types+of+nucleic+acids+arePDF link annotation
    • 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_off0001483d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001604f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604F 17488 bytes
SHA-256: 1bb88d4df24e32d774ba1c8e6f19318abfd5c850f50e2f009e3d8fa8e20109b0
font_02_sfnt_off00018e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E01 10876 bytes
SHA-256: b6d589294b42ececc03284a180b91b23d796171598b1d130121b512c38c83ab3

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