Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e518f9560745aef…

MALICIOUS

PDF

88.3 KB Created: 2021-09-04 22:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 24505889cdbc05fcadb1fdd65463e10e SHA-1: 8f11f30288e50dd338c6a91b0df7b2cf9399e8b2 SHA-256: 7e518f9560745aefcd4947226eaeefa841bca1e182c15d69e9c8b4303caf3e3c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=epson+receipt+printer+tm-t88v+manual PDF link annotation
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/14624784681.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d957966ef12528f97264f60a64f4d198/kimiwixijewinizibes.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/osnd53tbgo6jn9t9jvn6o4svpt/30985508330.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/gavewaginasufulesofaza.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890af5e881d---66347080389.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160adf4226b8d7---benewavutufitupubupawenif.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16094afd7a4dd6---90051701580.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/pafinakojumosowigapimuz.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/vugenagafer.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/moperutuv.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ip875pralro9jlatrpvajlm7fj/60763385479.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8baf7012ae32dbf75782de2a0107c89d/defoxipusawaweluzotor.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/89677768503.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/tunilapukutenos.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/zijezuvomaradirumapovus.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86226ade8b---32518084935.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58523c7f5f---90108248511.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/23575905986.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/64661286082.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rukotofesasotolubet.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4q1pr7esft3102ten5fkjlspi3/94482862088.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kanafojejevelojat.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/49644165741.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072987fc3428---36980101933.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_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 18304 bytes
SHA-256: 139ce549b6f1e888446fc3a41585726869a5391111af40fe53dbb67108285b48
font_01_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 10924 bytes
SHA-256: 76341efd1331249a7ddb2cec8689def4f5e51479d892d7334af8b3e2d6fb718c
font_02_sfnt_off00013b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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