Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6c6718528112b8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 02:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50c9e2a366b437d3003a4bc979a787b0 SHA-1: 3f40d69bc86e9b643f56fa89fc11f8b3f9fdc04f SHA-256: 7b6c6718528112b8c836fcdea457da08ee73f221dc2a921e9e481d3c20d9638e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and heuristics indicate it's a link farm pointing to potentially compromised sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=reveal+wifi+password+android PDF link annotation
    • https://doina.md/fckeditorfiles/file/bunizirawonofak.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/tizokij.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/dofex.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/vemimupiwuzepufukibi.pdfIn PDF document text
    • http://hklh.vip/data/attachment/file/20015123176.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/riretuzeremib.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/wikomumimo.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/sawuxipakiluwotijafelirab.pdfIn PDF document text
    • https://cmoretv.com/userfiles/lafivenav.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/ratevegosegiwez.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/lagunipijuniseserogitin.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/vabepuserazinixafexap.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/libevo.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/julezaxo.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/subiratejusotudinufadufuj.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/mojeluben.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/68113933994.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/42674048906.pdfIn PDF document text
    • https://servauto.fr/img/user/file/gofopivinaga.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a232a9f11d---20041660528.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/89942791960.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109150221171045.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/cb5cf24f06e6be837d429b0d311df107/judum.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/21780455860.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s28kdivc4r6qicnvaueh5b8jtl/famajixaxaxototomifub.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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 17988 bytes
SHA-256: 9d6f82bc2afe819ffc951b7ba3ee70d1e4b2c30e53b5df4b2307fc8ad5c2bc63
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10592 bytes
SHA-256: ae3680c80ce3ce0fdfcb2d8c99ad2b625bb412c88a628f9e14cb18642a7bcd1a
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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