Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f6e7bf1b44d961…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 13:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e1df644a5c2b1cdfd3035bddb7f5a62 SHA-1: d2b204d5814412fdbd04bd95bf667dd96b093c10 SHA-256: 91f6e7bf1b44d96106caba7e6411831d4099d209f3200800b41a04a6b5869aa6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the document's nature as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://wastran.ru/uplcv?utm_term=accuweather+widget+for+android+phone PDF link annotation
    • http://cesarrodarte.com/userfiles/file/38461043857.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/69308565201.pdfIn PDF document text
    • http://one9five.com/userfiles/files/20811099204.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/wezedugarijolawosojigimob.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/tumiviremuzexezi.pdfIn PDF document text
    • https://websbag.com/uploads/files/18246624015.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/gumuze.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c48627bd9a---zisexekabuvu.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/51090746876.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/pivelevipebapibunugaganog.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/86826999627.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/65468196808.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d77bb9adb3a8cdd0b0ea10843c39cb36/36527974404.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/gevutubuwezonukuwizi.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210920/file/73968041099.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/lepariwajamisoniwofileli.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/74698258397.pdfIn PDF document text
    • https://cityface.cz/res/file/63469801605.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vawali.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134177737278---lifaworeredipamar.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/76965748698.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/vogamotipawulalop.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/82778177918.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109020547408693.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/62003616668.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/11806452746.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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 10852 bytes
SHA-256: da6b735a03d64d7a4e2cf3154056d5e27f89aad056da93f75724c1f5bef01e57
font_01_sfnt_off0000c9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E8 14608 bytes
SHA-256: ffde176a03f5dedb9a8d1ba12b0efe920ebae80a80063c046efdf989e0f6551c
font_02_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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