Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec373e51a639da92…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 19:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1969db2208b43da8d2a8d14ec257b236 SHA-1: 450314b80cbdbb81963a6bff2b3a8f05eb4f5fd3 SHA-256: ec373e51a639da923f72ed3030d14bdc7a8e052eec264fd295ab10973ccf0bd6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, likely for phishing or malware distribution. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://inwebjor.ru/uplcv?utm_term=moto+racing+game+download+for+pc+windows+7+32+bit PDF link annotation
    • http://101balkon.ru/upload/files/kuzezatebedi.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/97847624198.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5a4cc9eb2df2e8fa39f66447bcf0a8fc/mefonateromilirotodasupi.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/27038610960.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/surapisagisibaj.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rifevuvojivabugedulajid.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/wojagufovud.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/lunoxuxejiraji.pdfIn PDF document text
    • https://rosycaffe.com/file/texoti.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/58483981054.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5020bec9e---gipijeterovutam.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/22470404447.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/lipojudonal.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/13654132782.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/wigijifikifojowemavi.pdfIn PDF document text
    • http://apothepharma.com/upload/files/96461188824.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/magutapetutexo.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/98127348722.pdfIn PDF document text
    • https://emenu.hu/editor_up/92617585073.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5c0c6a96492253c7b287b3565b675215/labefona.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2003f9c7234c573ec0e1350bd485d836/xopesudazazuner.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/romojik.pdfIn PDF document text
    • http://oodow.cn/upload/file/210916093329232004uygru539hvgg.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/konowaxoxotu.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_off0000af28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 11524 bytes
SHA-256: eabeee9fe545dbc920d08b57c23ed7dbdcb0fc44d54e0018b6199f742563aa8a
font_02_sfnt_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 16004 bytes
SHA-256: c6f30345b78f895bb4a623a51d3aaf36db400641dc50c51477001acb3b51892f

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