Malicious PDF — malware analysis report

Static analysis result for SHA-256 171eb434c7c95ba7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-17 17:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 565d0d46c95c3120f3376247e190989d SHA-1: 39a85edf8345fde380b9206cd638b8589c14e2a6 SHA-256: 171eb434c7c95ba7e3f72e0c9f571e67c56e0edd7b15af52d9a40cc219e5315c
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and exhibits characteristics of a ClickFix social engineering attack, instructing the user to press Win+R or paste a command. This suggests an attempt to bypass macro restrictions and execute arbitrary commands, likely to download a secondary payload from one of the embedded URLs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://crewmak.ru/uplcv?utm_term=adb+driver+for+linux PDF link annotation
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b4291200d---79591353433.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/fuvejumajobu.pdfIn PDF document text
    • http://regmac.net/userfiles/files/timepatujemedojegupuzefem.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/pakewasunabi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133624b4eb12---70213711885.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/94462119792.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4829_20210913135316.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/roxudivisodudogaxase.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/misopiwos.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f04a5908225d3a5dbe67941058b4358e/fobebogisedu.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/23800284974.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/sugopodujotudepuzozozu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/28597021441.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614495085adbb---55611446919.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/93679401789.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/36205451936.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/mabizatamitigivizogutiv.pdfIn PDF document text
    • http://xycrusher.com/d/files/muxomizevi.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/fajinawizowedizusotisulon.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/dadopalatajupazuwaguziro.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///83888113450.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/2851845796.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/85824010046.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/boguke.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_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 10308 bytes
SHA-256: 2f7078c04387d5642cfeb32b27c2fb6c679f08d9d7c9fcd2817829d89630de76
font_01_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 19820 bytes
SHA-256: 799061db90402b46871ed0cac74dafa36330c2d8c3120f66f2983c0ea935e6d2

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