Malicious PDF — malware analysis report

Static analysis result for SHA-256 5173b4880706f913…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 08:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f301acadf7b39d43d69f4711068079b0 SHA-1: 6f0571b04a38e50f3409161edba5e8fdb1f5de21 SHA-256: 5173b4880706f91324912e0c642c2222be2bd91167b9d4c2dc07afd2108488f2
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the document is a link farm pointing to compromised WordPress uploads and disposable hosting, likely intended to trick users into downloading a password-protected archive. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://at1-turbo-j3t.com/contents/files/79784608893.pdf
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/84554271888.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3131cf5f---46806555007.pdf
    • http://plafondchauffant.fr/img/user/file/49784672723.pdf
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/rubalodewugotokelepipoz.pdf
    • https://ruiguoex.com/upfile/files/2021/09/03/81094409677.pdf
    • http://langfordfinancialservices.com/userfiles/files/nilalemewenogemigegebo.pdf
    • http://factblogs.com/uploaded_files/userfiles/files/suwimasezuzak.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/fasaridafazogowinuti.pdf
    • http://yuanjiangchem.com/upload/files/80420470136.pdf
    • https://suprizpin.com/calisma2/files/uploads/27172687188.pdf
    • http://suachuamaydemtien.biz/userfiles/file/nafiwusodawoxofezixiriko.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613675d42073e---32496161430.pdf
    • http://ketnoikienthuc.com/upload/files/wojami.pdf
    • http://dgkno.cn/upload/tuteze.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbdd1efb6---75962868136.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/10343098546.pdf
    • http://imdad-egypt.com/userfiles/file/40768861249.pdf
    • http://kibbkw.com/uploads/files/fotiwip.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/82236642806.pdf
    • http://biondiairsystem.it/userfiles/files/25553351813.pdf
    • http://www.mustwalge.ee/data/content/files/rekatitimaludiser.pdf
    • http://www.binghan.my/userfiles/file/dekepelogivo.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab3ef0ca5---tuzunov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chromecast+ipad+chrome
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 16792 bytes
font_01_sfnt_off0000e492.bin
8f1b62cf8b82dfeb8e229471ae42f68f00687348665c76a7742d46a2e8245343
pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 10660 bytes
font_02_sfnt_off0000fd0b.bin
fb55e3ad684b2a8f368e1bf03066e67e4723162bef5b2572ef946cb4d43b6037
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 20792 bytes