Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38e8d80a4543796…

MALICIOUS

PDF

76.7 KB Created: 2021-10-15 17:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d97f428856e81e5df59652f354746e79 SHA-1: c0501aa052482b0bee839a6aec414dedcc4e32cd SHA-256: a38e8d80a45437965ba4f657d879ca7a3b8732d10c0ad68711fb31f0d4cbcfc0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fskyok.com/uploadfile/files/navisegulilotodubosivolir.pdf In PDF document text
    • http://songhakbbq.com/uploads/files/50023361437.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631738897.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/52890352052.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/roladenek.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/rofebosunemaropewifedub.pdfIn PDF document text
    • https://mcsfood.com/images/file/20456221667.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3150d8c077818ce27e921fdce42c2b46/98571631273.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/kilupumasanugukikopon.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/3857378158.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/59757752659.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/vesopakazuleluranomumam.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c8a32330a---gidil.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132077cce377---bukawuv.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qup6c45csa1pq718j0l1rs9us1/rojizubemuwatodalerelos.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/vuzegalutemojurunemu.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/40677907694.pdfIn PDF document text
    • http://koala-al.com/d/files/20265113043.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/77117711635.pdfIn PDF document text
    • https://affze.com/userfiles/file/30651450009.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/55909ed241afbc8b4deaa7320440efae/69923321869.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/sokeruzajojesuz.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/nomazobisewivenut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=12+science+physics+paper+solution+2020PDF 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_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 10880 bytes
SHA-256: 7e48af250d881b2cef2d7e65c37959fb533de9224c192aa7d83c127ec85f67d1
font_02_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 16712 bytes
SHA-256: 5b64cbaa077851890bef68a1aa2855e8a7758461940a76db33bc3171ebdc1845

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