Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff3cf9f808f9d1c…

MALICIOUS

PDF

83.3 KB Created: 2021-07-06 20:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 996dfe4d02df456e6ee5bf41592110e9 SHA-1: 61752e16aad2388a68e878eb3eeaf6ebb1249df8 SHA-256: 0ff3cf9f808f9d1c5c77bd01d7a9f32216d7bcfc28c4b0c510eaa4cacbb73a71
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM firings suggests a deliberate attempt to obscure the true destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=places+to+get+ear+piercing PDF link annotation
    • http://myucmas.com/userfiles/file/19795802354.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/54569176538.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8f2ea901afcaaec8b3b7b8e827debcb6/52538375829.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/dofuj.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/94613287525.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/316040295.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/34750581961.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/vafuvozatubobepifu.pdfIn PDF document text
    • http://jucal.es/images/file/lewolekedelalosedede.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/doboruxezugupikotafut.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/cj90653786jmqscimrcm3r20nc/derotate.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/5248782232.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/47095304882.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/34kaj57h95172a1c79e9fote00/jojulisufiwebife.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/9639368019.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/i7t9v1qa9h712117q53fk6btml/xukuxitakadajisejuv.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/vobekigojuserup.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hu3v7gtm5v5ae17k56ol91tqqi/557961572.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0ee53d3a---norirobavogesu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160967fb94c4b3---60566648881.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/26942837104.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/jenigopusidegukuvewe.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/98370596c248e2f00a750c7593056cbc/doxamadugasusakomopaxozop.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_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16780 bytes
SHA-256: 08a55bd73aa1b97da3c9b94bbb40bb7f9ecac7de7b6d487290e8af8ed5197b6e
font_01_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 10548 bytes
SHA-256: 269dee617f2a3f403dda337c15ec4aaa67618448778779c6e32f709d1a5732c7
font_02_sfnt_off000127ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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