Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c9965c8458cf5c…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 15:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7daa02eabc21c4af2ebcd43f4138f1dd SHA-1: 5cbee39222bc20baeae278d104aacb4696c10397 SHA-256: c4c9965c8458cf5c3006357d9bb7127c655214da67a4b0fff7e561afb7b4dd01
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to leverage disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5146ea7d89a798f14f17d28520848bf5/58165788124.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rgt0mn404ut0hvvdvkmp56q9u3/zomejekekofobituxixonuzez.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7720fa2de3---20265039897.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0886d07ca4---77178981000.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/matubagopokijizijezifusij.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff42513049---muzozovedeka.pdfIn PDF document text
    • https://edusfera.pl/upload/file/74100574921.pdfIn PDF document text
    • https://begili.com/uploads/image/files/jekafobopetudume.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/57054790231.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/timumove.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0506415001624832384.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/8af8a33352065d933481a670de9ccb72/98853611755.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b8f16a2e7---tenijogugorug.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a9aa6c1434932a34985caa9af433e453/jevaxamovebog.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1164ef77c4972c17742dc0215208aab9/gofawusexunozolatikuru.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcdfc97bcb---kopibemumesukut.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/43830469225.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/39625576137.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f1658735---xiroli.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/56821055063.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fn240tcco533di8io100tt3824/botavi.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/f8558f87279a838a0abcd0befd3a3b35/28939980108.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kjtiucbqsc7glnv48or6mn53e2/97129903888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nails+and+youPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/sezazisuvatata.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_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 10104 bytes
SHA-256: c74940218cf37a48e22d43fdeea8b844dffbd5cabc68b8eb2f05ad8e2e83d73a
font_02_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 16836 bytes
SHA-256: 79cede9da4de80982ff65ed2dbe3b7b16e9f0d7963246503724ed8ee4c83a260

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