Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c85472f3ab62cf1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 19:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58147cf016f3c8e35770f6ad25de2265 SHA-1: 2e99a5b7d24d9b14e5e5eaea308bb9407a7eb359 SHA-256: 8c85472f3ab62cf1619e1f6d47256a5c77a224ee564a2003d7737f3d0ef14bce
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains. These links likely serve to redirect users to malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/wefixapikobib.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c426d8f1d6---77926842047.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/46880209572.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xazedefarixeraseduj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1c739da59---2048303964.pdfIn PDF document text
    • http://sdes.in/uploads/680053781.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/jotugugupexuxedeg.pdfIn PDF document text
    • http://carbonelite.ru/file/bowowiwerekisefokoba.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/88e1f8de00d6fade4ca342b595dd0549/28157947236.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/64980895617.pdfIn PDF document text
    • http://leton.pl/userfiles/file/6043471076.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/pebaz.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/10427246493.pdfIn PDF document text
    • https://actor-conseil.com/files/file/gusinujer.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/gewub.pdfIn PDF document text
    • http://youil.org/userData/board/file/titazobisidijemuj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f341086cb0---93786574872.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xosutisebofawuvupuwepifi.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_961B084C7ECF3019.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/11203616530.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/89879366855.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/zenosivefolijigufol.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/sukinawu.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/99479224068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=can+you+cast+your+phone+to+tv+without+wifiPDF 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_off0000b038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 17332 bytes
SHA-256: 918fda4bc1ddbdf89681201ca2891be9c10aef84148cda9649fcd240990d0ef9
font_02_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 10928 bytes
SHA-256: 8690fe71b1a90837774cff79a4f37a9644bcdce91413d537cff259481eace655

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