Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c9c94a0fbe4213…

MALICIOUS

PDF

112.0 KB Created: 2021-06-24 22:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5b785efa9ced3edcda278775bd7e1b04 SHA-1: f5d0453791827c791de0909e9e26f66720ca2189 SHA-256: c6c9c94a0fbe42138e6ea0e68625ec869cd4ebc165c4ca299da0d8616531e044
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to facilitate the download of further malicious content. The presence of multiple external URIs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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://dbjadow.pl/attachments/file/tijok.pdf In PDF document text
    • http://auxerretv.com/content/public/file/7906403645.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e481e235---93335708374.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3dd50443ec1b43754668da0630403184/noguzesujojowepunos.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b7c5355a242bccad0299946e03dedf05/18269772250.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/79908979923.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/be6342c127c0236fd9a76296e684410e/worolowanuterojojafo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/60444326770.pdfIn PDF document text
    • https://peterdegendt.be/file/51197229028.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/383065ec4e6173817834f97b2ca83139/50631080838.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a6a79656---zetafisepefabigomepunow.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5a093cb5c6dd6d9e2fb2ed8cee9fb6f4/gupatixofumomewebaxode.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1287bf3a4---xijuwunibepetamawirepuzi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607922131451a---nibaguwibereravijupinu.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16075325bdbae1---84004318566.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/bekoka.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a341abe7a---lazekoxumalamofun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=marema+ka+dika+pdf+free+downloadPDF 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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 7328 bytes
SHA-256: 3a1cd3a39de3f051ab36966289b5d3e54946ff47624557c4ec645ec7e2b91b0e
font_01_sfnt_off00014c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C07 5168 bytes
SHA-256: 3343f111252fe378b4edfed9a9b23897d928ed5ada5890a81b4a01372bef2739
font_02_sfnt_off00015da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA8 25452 bytes
SHA-256: 26fbd711738ccb1df875c6bd166a918ddbc88731ac78d9e1615d50d1d7803088
font_03_sfnt_off0001992e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1992E 16548 bytes
SHA-256: 58a04dc739243ddecf90f4e4085eccc6eaf1bd0a14d2a83957fec7fcf6bf8b6a

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