Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dec5f467b5f6099…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 14:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5359e621f569e0b95c5616885d1df158 SHA-1: ba62283fc34fbf7ad66cf39c760c009958978227 SHA-256: 2dec5f467b5f60996134d5c656b2ed8cfb9aee694ef4622bc93a897bfd9ee98b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://olddieselparts.com/ckfinder/userfiles/files/zepiribugodojutazoz.pdf In PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/73926575579.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6e1ffaf70b291a9daed40b1682d475ab/zitedagomimifalezasi.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/45519365357.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/80562162682.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14b6d4bddc---96915183738.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/75d6f129ffe6937e132c4ffaf7801dd4/6049381252.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/82864456943.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dawimeg.pdfIn PDF document text
    • https://aashianarealty.com/file/maromi.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/43881592973.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eeaa312ac---46939473519.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/fabufotazekidimuxab.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9n96892k2uehhvbo6ggdij5f51/bafozosogube.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/tenefojezu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eadc125aa---23714717944.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/tumovukisupewin.pdfIn PDF document text
    • http://moneymaker-gold.de/files/fekobebalulofoxed.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/74022340733.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/xipejig.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/93643576122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=glandulas+salivales+pdfPDF link annotation
    • 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_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 10380 bytes
SHA-256: 8623f30e1e6380ffa182d37043848f925da63fd203f2d09265fb6c6cf064eea6
font_01_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 17992 bytes
SHA-256: e3f6e44f57bac283b094c7178bfed20ebdb368d902ae89113899d129b12f3787
font_02_sfnt_off00013156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1