Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a651fe0c93cdb8…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 00:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88ef33c28dc62eb0b9d402a35ade355c SHA-1: ca78818a26334daeafe9e4d66a66e8ee3364c4de SHA-256: 89a651fe0c93cdb8d9c53f405a232d7b10c6fe61dfeb74aab642bf4e5db9d39a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 various domains, some of which appear to be compromised CMS upload storage or disposable hosting. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the link farm suggests the PDF is designed to redirect users to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cvsc.co/userfiles/file/tawutuputunivoziforiwow.pdf In PDF document text
    • http://phatnang.com/media/ftp/file/86020300574.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/34309965657.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609777657d9a9---43445169620.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7a6b361f---fadepamibi.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/79409661984.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/vinerunaxilasanegekenifug.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7beee7bcf---40965048950.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/fiwusabowazuv.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/96347914639.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/efcbf4cj13udl330klsan13lt7/kivabomumalivudutora.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11350be56---mabelojer.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/gezezozosaxenum.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d387c556df1---kowunamugibasalozutin.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/kurupevejavofuga.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bb7cd1cfa---vokenetakobow.pdfIn PDF document text
    • http://aimic.com/userfiles/file/kagav.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/dogubifa.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/6c5a1256405632f5ad4fc7559f89f397/kipubil.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/33498396158.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/63374137113.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871acaa5b2b---77622636250.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/80823077070.pdfIn PDF document text
    • http://synfarm.com/upload/files/58194902863.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/88205213803.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071303202773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fci+latest+notification+2019+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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 17856 bytes
SHA-256: be0d162955fca198322a8a53423cfbf88f50925389778abc037e6502b57d758b
font_02_sfnt_off00012b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 10952 bytes
SHA-256: f69b921e36a6f3f646992c0d828ccace1d88c29830d30d6970db85252e9cdfb6

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