Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01cfcfaf0246341…

MALICIOUS

PDF

86.7 KB Created: 2021-09-03 04:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f94fd75e4be0d070413a7bc2ed51b93 SHA-1: e1bd53eb742a896a875706eab852b879befa0551 SHA-256: e01cfcfaf0246341aad38e3cdad99e7836146d8fced73c3eecaab3e1321ac8e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crewmak.ru/uplcv?utm_term=non+impact+printers+pdf PDF link annotation
    • http://assushop.com/userfiles/assushop.com/file/pejevusefa.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210901175724.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/72133520005.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/jemunakekelovo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16110629ba1430---90684371179.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/loxulikuxele.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/vobimoj.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/42477022933.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/bidowerawarepozafoxoru.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/40285888259.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8676cbadda---1061743618.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e893cd52---piziwomumitiwenosirekep.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607528b0663f3---28191317155.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/zivotujuk.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/d8c8bfa03f96879838b8d3e8875b783d/50804717947.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/sanominifozuferanukoni.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a16292b03be---kijovimezuzakot.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608679b5eb435---kapodezitevebusujadi.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1298070599612b8736af03e.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd569dfd8---solowazowo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68714446095.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/57986715286.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085025130d66---96007191035.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_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 17584 bytes
SHA-256: db964dda1f8a8f3051ba5f6742ae028f9e0cb1abb4ce559b0a06215135d4fbba
font_01_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 10712 bytes
SHA-256: f358bfa67acd0cc7db9acce6d01ac6f2e6420b129ecb5f54b518dad777befdf9
font_02_sfnt_off0001357f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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