Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd46ce876662003…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 23:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 634ab2754d0c143cc5990255c41f134e SHA-1: d989bc760547129d9d2c3d5e385b9a207a8355a6 SHA-256: 8fd46ce87666200367a3313465ba7018e87dbb05f65eab012713a88bad830c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable or potentially compromised hosting. Heuristics indicate it functions as a link farm, with some links directed to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://4bx.pl/public/file/susineris.pdf In PDF document text
    • https://alternativecarrepair.nl/userfiles/file/nerokuzesamidunopaduriro.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/29813010528.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/widoloregokirezisebebesil.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/zanage.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/76549064779.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/53312254341.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/76111714599.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/viwovenusepo.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/11276803112.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613472e8e1ce6---71359636376.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/kijofokenabogesililodaku.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/db7557de30d47bc8d4f67017f89c4ac7/modet.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/31309949359.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109071228282200.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/93535057291.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/45299847934.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff569f6c8---zirelozerovevurodib.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/94296495712.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/sofaposepubo.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/75931976318.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/sipotezeganinadoxemewowaj.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/12551142463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+old+version+of+gacha+lifePDF 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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 10684 bytes
SHA-256: 0320023c51231e5e67a9f3148ee391a871f0a73c4ec41a747648035a1511c5e5
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 17300 bytes
SHA-256: ed8438a7f72d8e0778435f981610ef0371e84919c0cea62ce7830cfb265d590f
font_02_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1