Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8916124cb3f81f…

MALICIOUS

PDF

83.8 KB Created: 2021-08-20 20:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 942a4d60e170d8d596dc9e674864087e SHA-1: 087f3f70b163487443c408aacb2f7687e5f9fe86 SHA-256: 0a8916124cb3f81f1957456824e20625e7df1c1ea4c2be50fb9ce494a7f74366
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to exploit users through phishing or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://wastran.ru/uplcv?utm_term=cuanto+es+6+pies+8+pulgadas+en+metro PDF link annotation
    • http://citygclub.com/ckupload/files/lomuwezitez.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5b00afb0---tevopuw.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a2021c660ac48f11b8402576ded86cf5/60725364089.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8a7afe83---68197021461.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/989a3ebccc66a98fff1554f3834431f8/vojemegafemupa.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc8357c36---xexokugodupigap.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/punomavekojukatokozolit.pdfIn PDF document text
    • https://sbufficio.it/file/63502236529.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce6da04cf---rurumivufokilub.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ddsju0mb787ivd02mktej6rele/keporafutakamelolavesuw.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/peligisasoba.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/85343390717.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/24570169071.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/73237056664.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/34640275028.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/73007568456.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9e5837bb4---56068118501.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d10a560515fc9dce207c95be1e2a0f24/39486914509.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/bunavelexes.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/xevomanalisan.pdfIn PDF document text
    • http://proxima-design.cz/files/file/pasifosetapedinebigibod.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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 17296 bytes
SHA-256: 1f8f69608c60dc453082c5a66dd3bfe67bb8332117cd7a83453ce7c9c2da66d9
font_01_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 11240 bytes
SHA-256: 8df757d8f82e7703c3de7ff3ec546bf442fdb0cb9bffce422ab2b2ebf27bb2f2

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