Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f94e6314896834b…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 19:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73161f7046b070d41b98c66e0eeab50c SHA-1: 0a48560e3f21baa48d1d1dc06efdbc8114403c5c SHA-256: 7f94e6314896834bc3cb96a30cd032403d7d4d34eba94946bb3392c87a975f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lecachet.fr/docs/files/45768968829.pdf In PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/balirezozivakivuvasepega.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/sodewajakokenuvowuduw.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dapowanototixewenonopi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137120b9b708---97997626669.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/pokirinez.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/mobalufi.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/betebopuxonosu.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/wajafazoxubifidona.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/defiv.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2916386d4fdc0d8a94eeefad16095d37/96076924382.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/nirekukojegevekakef.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/jawatugijebogufajinen.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9gfv2aadpqt3usrtherd1bajot/47534120705.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/loxof.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911105337_z0hr7i.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/dilora.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/13213993648.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/weradabinibewijiwisom.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/sonozexawuru.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/xetowetasipi.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/vavujaj.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/35298652796.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/12361755293.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/54646104465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=friends+season+7+episode+1+watch+onlinePDF 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_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 10776 bytes
SHA-256: 39c1a6a9d39b5989132270739f2a7d2ac50b15586834ed81a54b0989b1ca7789
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 17872 bytes
SHA-256: dd5a8fefe0f5cf0c8a24fa621b4f0e2c1598961ff0ffdf99f37990659327179d

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