Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bac002dd29959c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 05:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 085420b53715c16a4016180f5f0af14a SHA-1: e1b24691ffca603885b5d65d9b506c2f887552e3 SHA-256: 80bac002dd29959cf01c90976d30051a3ed2a1d5f76f52cb6738b684cafc2e73
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting domains, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://guanlai.tw/uploads/files/202109151019464586.pdf In PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/vukokixirifoxapiturajolu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdf620e10---93438890396.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/37874655765.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/dosifetuzukorujaxuz.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/gefazanodorazateji.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/kekakokelixigomajoxufepi.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/43842491628.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/mumexinidazujatavoxogel.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614151424a9ad---bodijub.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/melulemepoji.pdfIn PDF document text
    • https://tekartltd.com/upload/files/69334647009.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210922_141353.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/jamituwakimi.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/59639659555.pdfIn PDF document text
    • https://argumentua.com/i/file/bopijegofoka.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/kagoboz.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210906/2253306578.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/27375575032.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jexidolej.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c2d3d402---39184771467.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/fibusatimudoxa.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/37383438578.pdfIn PDF document text
    • https://expomediainc.com/upload/file/56508627896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sygic+android+karten+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_off0000c4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C0 10744 bytes
SHA-256: a0392c5cb62bd37013b185d62c68984d5771bdb4fa863ef443128b17ac24a713
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 17740 bytes
SHA-256: 700b33b561fd042a1780e3e074df08eafcfc25150e68b9068cf47bf2129a45ec
font_02_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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