Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afc7fe6351a9ef3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 05:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c6b01abfaac5ad89bcbc716ab64f67c SHA-1: 5452cb18e2bc355c816495c4ce1a995374b109e5 SHA-256: 3afc7fe6351a9ef360a1c56b7b828c4d6b80db9f26f1e2aaf5a3a2b6d1b67deb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=apowermirror+like+apps PDF link annotation
    • https://khonggiansachhanoi.vn/uploads/files/nigaroxiwij.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/81227825687.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630747405.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/pomuwowazobopako.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b344af281---5926908360.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/82771821770.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/kifiwasis.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8cb4a0fb00188f0d74317ca4f8c93b52/zuxoziporunedetugij.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161387b421dac9---zapibadojowabedape.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/98220602178.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/54747065582.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109012205476273.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/donigoramimanogofuvil.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/kutivenadagepumutukodix.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/setekupomexemedoleke.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/76248925215.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/nelijaxofikuf.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/44321101253.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/82109647242.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/kakuzuwiranezovapiri.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613138597834f---felukopanudexixifivemira.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gofog.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/56043170883.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/dilatulifalasojatoxadepe.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/ledomo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b7a9858287ba824631735e5cbe6a55f2/56401831536.pdfIn PDF document text
    • 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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 17596 bytes
SHA-256: f768d2bc5fc45c4cff425999f7fc5bf7ca8ba6a7f910a9a7eae869d83040e2a4
font_01_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 10372 bytes
SHA-256: bb6da9e7afbe911cf07398fd6fddcc63630c24e2f26ae79ed223a2fbddeada23
font_02_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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