Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ffdd574d39b7fc…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 18:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c35f8fb0bab4e3ae6ce8697750b7fb36 SHA-1: cddb16f3bd2679d709ab0d57e0cd8ff07f044ee0 SHA-256: e3ffdd574d39b7fc668e56b4bebb3c47d36e006efbecf69c9f5573ecb3303567
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. Numerous external links were extracted, with several pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample.

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 https://sport-jicin.cz/dokumenty/22001763742.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774eb61ebe2---25332589651.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/80594556233.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/suwexitemivusafalasiji.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/nerokuruluw.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9e774804af012026bf7366224194f891/73937152940.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/werasigunokagubenanit.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/bowewabisiw.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/gugulobipesezizununag.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96da26ef3---zozisekalikowajibomabuwiv.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/59651471754.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073db1342dc1---34233744398.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b0c8bf2cd8b346907b793fbae79bf5e6/75982150853.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/38640311558.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/dosewareronoxinonog.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161133c7948f37---vigovalugito.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/tepabaw.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d6c4e099ea5c8c375a8a54c56c842353/43251099206.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/newowijim.pdfIn PDF document text
    • https://alev.az/userfiles/file/13301210887.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab428d03ac---61486622208.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/kowawaga.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/22632439380.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2f8560df---66314652522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=zanussi+tumble+dryer+lindo+100+manualPDF 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_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 10900 bytes
SHA-256: 6f622d21989d76dfc4e1621e8a724503a0161b334bc90caecd9b902b157d143b
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 16904 bytes
SHA-256: 2f49be8dde5535dd586b7f2067423e2b8ac9bc2e5602b686a5e5680a2250a452
font_02_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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