Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec61a3a6a764811…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 06:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d2edf84d60a89d68764be960b45c029 SHA-1: 699b377e392d0ddfc47f9c199571aa29729b857b SHA-256: 6ec61a3a6a764811567d6e1c209135ab5f8f0c47f7e430eb5f6243f8452f4a7a
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=sonchiriya+movie+download+filmywap PDF link annotation
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/biwijuvewafatuxuvaxegi.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/85862598592.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/60401651857.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/zovikisugewinurivipigi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef51bf26e---69521366300.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/53431866365.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191272954350.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/tababudugajododibesu.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090811291483.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67762dce5---40054182045.pdfIn PDF document text
    • http://packturf.fr/files/rabavapadodetorelo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d534682a---15856816446.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/19222561913.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/dujifofuwulisikumufe.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/66781598519.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e08f2aa17fdf02aa7d834be8c01b846c/39879993425.pdfIn PDF document text
    • http://jsdarvin.com/files/94230390255.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/77294249639.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/fokojalulezuzifu.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/wenaletagurok.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/88001921363.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/mexopojubagonogoranepovi.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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 10960 bytes
SHA-256: 9b047d1a89b9fa300930ba190185986e87e0990ecfbad0da9ada1b972fb5c437
font_02_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 20144 bytes
SHA-256: 9c77acc27786ee5f2b221dbfe95d7b3d2b8a4d9e152033e5a71181353f259fe3

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