Malicious PDF — malware analysis report

Static analysis result for SHA-256 6974876580c0bb99…

MALICIOUS

PDF

88.8 KB Created: 2021-09-16 21:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33d5f9610fd353ae8ac9a6818e1f8b3f SHA-1: b96d5dd352d68bd48be59bb772d4ae313d4b2cfd SHA-256: 6974876580c0bb99244c224252b95dbeeec754a73cae93f7f7915a9ffe83e66a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV flagging it as Pdf.Phishing.Trojan. The PDF contains a link farm pointing to various domains, many of which appear to be disposable hosting or compromised WordPress uploads, suggesting a phishing or malware distribution lure. The presence of embedded URIs and the 'SE_DOWNLOAD_BUTTON' heuristic indicate an attempt to trick the user into clicking a link to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=best+emulator+for+windows+7+32+bit+2gb+ram PDF link annotation
    • https://lifo-sea.com/ckfinder/userfiles/files/pagenekiwi.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/dafepugekiwow.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/1004472775.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/ponid.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/rariwi.pdfIn PDF document text
    • http://ustunongel.com/image/files/21464134532.pdfIn PDF document text
    • http://master-br.ru/img/file/winupajagojeg.pdfIn PDF document text
    • https://12tiga.com/contents/files/nasatureton.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/feturomijawusakaboda.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/91169686603.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/7111050989.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/ruvumesab.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/26102657799.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/vuzudid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422fe5ada2---42274873733.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/lamaledimuzebijakexa.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614341a27b29d---12786457862.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nofaredarumadag.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/sasabuxuxepolutu.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/69791645818.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1851ed0ec23daebef3f200a0fc58405a/70654299801.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/11972860097.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/tebojel.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_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 17932 bytes
SHA-256: 475c76ac7791e63aad104f2d3712c1d3cef59fa60fb9340a21095caa15dc2fc2
font_01_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 11420 bytes
SHA-256: 9bfac337eb90564dbf50ddc1701c7d8cbdcc9a2cd740df5eebc25278c6c0f632

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