Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c0d67e0102feaa…

MALICIOUS

PDF

90.9 KB Created: 2021-07-26 00:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 333f4d0c6665c34aa48065f720c512c5 SHA-1: ee4d6b2be21865f76a81496628b4d64b8730f8c4 SHA-256: 41c0d67e0102feaa96ed05d500f7661cadf8dbcb9dfc94c89f2f2a5a22fa0b08
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates a likely attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/92d88918737319488b82aeffd89124b8/90976926534.pdf In PDF document text
    • http://elturo.ru/img/upload/files/81270859394.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1468f02f2---79453251517.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/44134981454.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d49a5fea383---jovuxefekad.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/80459104242.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/q9v4o35s87qamqaoi6htgr6ask/97993338555.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0d0662e7---pejusezesa.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/zadixevukoserufozupa.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/barafor.pdfIn PDF document text
    • http://fitviewer.biz/files/file/bunigu.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/xatifobasikibes.pdfIn PDF document text
    • http://goldmustang.ru/files/files/81074725443.pdfIn PDF document text
    • http://cycling-software.com/files/file/xowazomefiwokoxizizibiwij.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3icpa795taktkc0r055b8slng6/ridikefozonevenorozikadej.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906995dee30---vasukese.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/556ee2b277e7de4c91a3a6642e749334/gegomabasigava.pdfIn PDF document text
    • http://elm3rad.com/file/44048225927.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/sapup.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceecc13c5d---65001205476.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a406b73569---wajeduromovu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ktjl9mht069826gbdm14khiekg/41161918153.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc2400e616---tasutewe.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/rurifes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=office+2010+phone+activation+code+generatorPDF link annotation
    • 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_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 17524 bytes
SHA-256: 95505e0b5a30793a2ce867886594fb025b21de09e6e3207b9e7a7f7dbe3ad5e9
font_01_sfnt_off00012c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C36 11072 bytes
SHA-256: a0498970d130ddc711931df5a75eedee128d68b303df4c5ad28789ecb1ef1c1a
font_02_sfnt_off000145da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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