Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfffcdab307c932…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 18:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ccb71b69ec675f53c5d7b028696b38b SHA-1: bb1c5f9c9225ef0765625a7c087b0a7fa423bdec SHA-256: 4bfffcdab307c932c84af3932d20bf0c5d508377eb90291cb5d85358454cd907
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure indicate an attempt to exploit users by directing them to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27063858b---26186883619.pdf In PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/93217239785.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906194946.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/9447598385.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/31521725820.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/80513015240.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1fb2e22490aebc3f3680c58e20fc7554/beguvizagap.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/rikovulelonajakobovesor.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/jimulejo.pdfIn PDF document text
    • http://sartor.ru/upload/files/4624050099.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/tisufizuvikesubuk.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/91998361794.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/53444972232.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d03849abce68ff2b104f4e9b20e6f74/16123196710.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wazirasajofazakonujizovul.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/33060076457.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210904145152.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090300052797.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/50097815498.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/82237228322.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/61383683512.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/40063436304.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/majebovexu.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091105501573499.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/50452626378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=genki+workbook+2nd+edition+pdfPDF 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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 10592 bytes
SHA-256: 5ecddbadb93b13acc8b65b87c943a2a2968dedffe38efd17504c9f2198b917ea
font_01_sfnt_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 23148 bytes
SHA-256: 4bcd91de47cd575829d11e4571993d23d28db61bf674f77f8ac160f87dd5ee69