Malicious PDF — malware analysis report

Static analysis result for SHA-256 796e59315fdd041d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 00:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39a4946c2701db892967bf0aefc8858b SHA-1: 02e91895befbf604106285e051aeed10565f7586 SHA-256: 796e59315fdd041d63abb77cf92ddde44330b99e268009929fe35bd119c30ab5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to malicious or phishing content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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 http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a873b841ab---86787883416.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rv4fi5f6c7mri5jjjvq7bjel50/1405557913.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/ponekifuxedigisozebunok.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/80081307547.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/beradazadolu.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/28228398381.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/weromexo.pdfIn PDF document text
    • http://candientushinko.com/images/file/69583624167.pdfIn PDF document text
    • http://poorclarescork.ie/images/62697609763.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/85697749003.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/gudinuzomivonetuze.pdfIn PDF document text
    • http://speckrepej.com/upload/file/vojurerumudapefuvos.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/36429798622.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210912_54A48D7E3BCD25E4.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/56023363719.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/77517378634.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/70774289372.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/4744194144.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/dedudaweberakobamusagu.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/45805045548.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613862833e819---fimoled.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/vofivo.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/75245216746.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/79878463815.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/dujamexowinijego.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/vifagisivafupox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mortal+kombat+2021+on+hbo+maxPDF 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_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 18076 bytes
SHA-256: 6809bdad797e7b0a430aaa4629a376a5bf0ff543b29128ba08948f0e0183cbaa
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 10600 bytes
SHA-256: ab5a8f73dcca764f0364752ae111333c4da6c75a3a86a2eab51d01add9b06a3c

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