Malicious PDF — malware analysis report

Static analysis result for SHA-256 64dbf2212496edc5…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 22:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 411bf6f0c5341727e9f278d9da8b633a SHA-1: db60dc2af73900242d7615b9e823012909b020a4 SHA-256: 64dbf2212496edc5668a7f72333e6efa604a4d6f2e147bf5a2fa3ef0e1b4e693
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDFs hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is unreadable, but the heuristics and URLs suggest a link farm designed to distribute further malicious content.

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://bocion.com/ckfinder/userfiles/files/92067149668.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136950b53781---sopetila.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/27983154757.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/53755809894.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397081412c2---sububitenuselalexagoj.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xanemiv.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/20960864662.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/wuwugusujufelezasin.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/39813548808.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/sekoworibonominag.pdfIn PDF document text
    • http://cutskytools.com/d/files/vativirafinet.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/besazekipevaje.pdfIn PDF document text
    • https://susta.vn/userfiles/file/60132283179.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614688616e649---58074931308.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/95440004212.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/19237286373.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/8899296881.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/99739108402.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/rurekudixezonawa.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/50970738456.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/47328953443.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161418c527326e---16096906041.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/23548551406.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/35628636488.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/fejunetinigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fifa+20+mod+fifa+16+ultimate+team+downloadPDF 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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 19932 bytes
SHA-256: b5db8e8d125a4de7ace741f1a28ac45d25036dc9ab420d352b3bdd9b09a9c02d
font_01_sfnt_off0001128c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 10872 bytes
SHA-256: 28582d61060fa61e53638a340de09c0d824e1ff646aa3bc00cc12e46dc9ca4ea