Malicious PDF — malware analysis report

Static analysis result for SHA-256 b745846f8efa4723…

MALICIOUS

PDF

88.3 KB Created: 2021-09-14 11:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b7084b20a6285dc5932c3753f82f198 SHA-1: 967d91b2ad9b744fc9d7c489598f9d07c4ce231c SHA-256: b745846f8efa472300bef333d5977cdf1cd153e6d0b09963e60b93455aa96960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs suggests an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=white+snake+full+movie+english PDF link annotation
    • https://bem-sa.com/img/file/mozujaxofizatasevel.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc82ca7e2---paratekeki.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210907_C72C1D73ED45468B.pdfIn PDF document text
    • http://synhbio.com/upload/files/51287658456.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/bivazel.pdfIn PDF document text
    • http://8njl.com/userfiles/files/gibevasaliroduze.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/25307078639.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cd041404a7883e1c1737efe125f6f7eb/13335996150.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/eaccd2d26cf10d952e726d5560817d44/94244867065.pdfIn PDF document text
    • https://webmenuplus.com/images/file/xibuk.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/19059649737.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/jetomipojekufib.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/natofepedizorezotimuw.pdfIn PDF document text
    • http://vhz.cz/user-files/fuvesurexorumewuwe.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nukerejawekisulixifim.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/dujinomomamoloxori.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/jidigal.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/75768587154.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xekid.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/gubizefavepan.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109080914513174.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210901124350.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/wozazifisala.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_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 22208 bytes
SHA-256: cb27b2830c5ca485ee2f08b37fde3be53c8b54d4bf374ee494acb179fac801a9
font_02_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 10812 bytes
SHA-256: 77f76d920a11dabae62df2a96f6ccbe3991124dcb8de2ed533b041ff28489d89