Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b21560e3639484…

MALICIOUS

PDF

80.4 KB Created: 2021-08-21 05:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bccd31d3ced13791cdba3284dcac3569 SHA-1: af8190efbfedc42ed539fdb5f3f6a1e3856a2e0a SHA-256: a3b21560e36394849dfc5f0a62d717637fcf6bcfd2b12ea7983e7f209c1a83be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate an attempt to direct users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=emotional+intelligence+daniel+goleman+epub PDF link annotation
    • http://co-mit.com/uploads/files/libonapolobowajev.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/xafirapalugevix.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/19002482482.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/3576588949.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c798b24da---70102254095.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/vamugetajipudirenid.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/84576959229.pdfIn PDF document text
    • http://cjatkinson.com/userimages/64261141607.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819a8f61d0e---72793779967.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/32906292304.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/dclvt68lgh7hkvbpvesrbi1mdu/wazupukugavivuvaj.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1fbe1f554a800ddd19f454ff635568d6/69546497904.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d46bc4dcec334861d4b8138ae30e013d/mexobejovowetefefikub.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/7277066324.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/19124447864.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/29388280350.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/86452158637.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/suwuxepofeloxakapefinoruz.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7edae2ea80dcad1fbaa4260d15e6e431/gurubesaxumefakituveduz.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ap0vfnlilldh1jhk4s9809rifm/80069002721.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kavowijuxep.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb994b97f4---7913097065.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/takilolo.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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 10812 bytes
SHA-256: 694e6e0d2c5023e82cb1c3913df8d73a842ac9ea88ff16f74c9bc38f1752a6fa
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 17192 bytes
SHA-256: ddb31a32ee60fedb2042518909b882797c579de7887912a5d391bde1bdf4d35d
font_02_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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