Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ba31c484436af4…

MALICIOUS

PDF

68.6 KB Created: 2021-09-19 11:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa26471b41782cf9ec8c5fdac74420a0 SHA-1: b7af40abb304bb20203a289c6391e0432cae6666 SHA-256: 62ba31c484436af4e806c478baa5b0d2a73ed0790869b070eed0104534efd2ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised WordPress sites. Heuristics indicate this is a link farm, a common tactic for phishing or distributing further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=messages+for+wear+os PDF link annotation
    • http://agapetown.net/ckfinder/userfiles/files/43476873513.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109070244464566.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/70837512797.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/medejikavikubok.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/pojusasagagex.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/63583512922703a2a18512389de29c7c/98882608033.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/lapedepujerazozalo.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/sewufoloseb.pdfIn PDF document text
    • https://triosms.com/userfiles/file/jonide.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/9249400606.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/desuwilamej.pdfIn PDF document text
    • http://geraldinekilkelly.ie/34220925367.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/gugixor.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/44373827059.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/28976756514.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/mogitoloba.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/mosukijizikajaf.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/bexuzepazatekenizisogiko.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/23078691199.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/nuvirutakumuzabarejadanug.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161302e9c97888---63508478800.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347b15c841f---jeduzesiwewujizuwo.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/17335191578.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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 10128 bytes
SHA-256: 12cd541d81372d653a0c42e171368cefbe2bc5f4b78d76d79d8bba636072423b
font_01_sfnt_off0000c71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71D 15112 bytes
SHA-256: 9e98e91b0cd051d80494080a856db2026019eebd3afef1128908355cc6b46de1
font_02_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1