Malicious PDF — malware analysis report

Static analysis result for SHA-256 1748bb2e077beffa…

MALICIOUS

PDF

90.3 KB Created: 2021-06-11 12:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 35a0052f48460e02d0312c219764b8ab SHA-1: ffb6f869db1ad44d85910d9705c484ef88ada16e SHA-256: 1748bb2e077beffa5350e4107018d0a3fc3ca0005b8e09b8bfaa62f5caec8b84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to compromised WordPress sites and disposable hosting, suggesting it is part of a phishing campaign. The document body, though heavily obfuscated, contains a lure for downloading 'gta 5', and the presence of external URIs and a ML classifier flagging it as malicious strongly indicates a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=download+gta+5+175+mb PDF link annotation
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086855d06327---xitilesip.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fitukinalufitozit.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/693d84ff9a5785cf12fe69a3e7fe1a83/12965074185.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/gamewivunasezinu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d0f83f73e849e6578129811466579acd/nepapowito.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/16151236246.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a482c83cb75---30227572800.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/lezelimifexut.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f62a6157b0139c536578275541ab7df0/67084743564.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8bc80c72---51870991533.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tvv8ptslcf685uqca60n086u56/somisokik.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094af343b3d5---89820730514.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/00ef6401a4f87f52b3c610c340fd5c76/lapupiga.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3bjmtehvo7svs5mt7cp498epa3/88998924227.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 5360 bytes
SHA-256: bfb82110159481afc42eda8205f63c4b89ef002551dd5fbcf62907283a6bf069
font_01_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 12300 bytes
SHA-256: 17d3a97e9c4fdedde74c9ccfaa7802bed6438b3fd116db9f4b78a7c6d7d6ca67
font_02_sfnt_off00014714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14714 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15