Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cf85baa1de3830…

MALICIOUS

PDF

89.5 KB Created: 2021-09-13 10:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2298668c7d27d412ffc4b1103382f866 SHA-1: 6fcdb2e5bd89b1b157d0bb2247592587225ce38a SHA-256: b7cf85baa1de38301472d30c619ee0e792826534e602ab947d4984b118a78799
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=porn+games+d PDF link annotation
    • http://bargiel.com.pl/ckfinder/userfiles/files/52839634207.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fasikaro.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161368c092845b---3653343516.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/varurigogawategipe.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/tiwugafa.pdfIn PDF document text
    • https://ysh.my/userfiles/file/muzosinok.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lnqo7dfqidc11o43vj1d4fof16/ruren.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/nigesofagulodisugawosut.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/lirugokototaw.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210909_120756.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/losadijojujureralite.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/pixixolifomozumasaziko.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/15077787656.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vesakixogetebejosun.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210909012335.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71449636021.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/75921873551.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/dosufavogiruf.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab34ce5a0---rubegimagojefubimofowo.pdfIn PDF document text
    • http://haphadoor.com/upload/files/jinila.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/rorozigurutasuvemewag.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/72354848110.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/bifuvubudosusubimagobom.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/pubadode.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135af2743351---sipumevo.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/wuvej.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136be8a55dfa---11529877518.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 19400 bytes
SHA-256: 5e366819adfb34a8de252c773b28feb478ba3791c1d5e2db400b32c2da07f67b
font_01_sfnt_off0001295c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 10356 bytes
SHA-256: a03d64685f99749039150f42c441b3d46af1aaeb775115b91c17845d22566ed0
font_02_sfnt_off00014089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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