Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7291f5edd06e7bb…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 18:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06eef1dcf43cc4bd26f6bcff9c86a1cf SHA-1: c5c26d1eb8c95848f71447e95cd06d3d12a91352 SHA-256: a7291f5edd06e7bb2b249e02e1809e44453e7cebb5dc97dba368f6089de54c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded URLs suggests a mechanism for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c701d2eb1af4c84b313303bd18bf235f/bebide.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee3fa029e---geguxuzibodena.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/potodisuvejebavanemixen.pdfIn PDF document text
    • http://01host.ru/userfiles/files/siwinujesepid.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/30223832183.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/32601573584.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/pebaribisu.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/33231083238.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/6752149651.pdfIn PDF document text
    • http://regcureguide.com/files/files/92372898680.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ao22rlv957uahfs5cvef50dd52/naveposidaxejolabisekib.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/36149360423.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/mexujuripudaf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082ffeee0f61---koxexobuvavewijofufa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79f2b1f43---daviwijewozugipezogovas.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16126e22a2fbe6---jopaforolonare.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/sinuxewapelujexukepirot.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb75303f8c1---bufifejimelotogifuletipa.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/55097194547.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/74434654653.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tvq1q9qa7f6rrrnkaag4473j6l/1521136231.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/32298406632.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/50e567cad5e2c69fe042c8c7562cb17f/sivipesit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=central+and+inscribed+angles+worksheetPDF 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_off0000bce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 15884 bytes
SHA-256: 9e177aa284d6afa925ff41c95322c62d07cdd7149c1c5db2c6f6624446e71180
font_01_sfnt_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 10996 bytes
SHA-256: 86fad5fa21fe792efca70b35d9f0672c14ad467baf0aad67b232425ef1619e3b
font_02_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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