Malicious PDF — malware analysis report

Static analysis result for SHA-256 f453d15e3b3d7220…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 15:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a452d2696f0512f6525e31a8a05acc04 SHA-1: 3e849cd21953a78eada7fbc868a649d42eb1ba34 SHA-256: f453d15e3b3d7220d8ec654d9a1e7e37c1edb7ed9abeaec163bb24eb6a92b8b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or scam campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://pistant.ru/uplcv?utm_term=flutter+and+java PDF link annotation
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/29011762345.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/15853213111.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/pexuxawi.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/11081087336.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/275917584.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/14325571031.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c7cc941c1937714b4b22887633c63778/venijoj.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/puzoj.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912045820.pdfIn PDF document text
    • https://tuyendung.tlipgroup.com/upload/images/files/39938302031.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/45019511463.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/19828379247.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/12868368992.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/31779648554.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/97096925394.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/83339027202.pdfIn PDF document text
    • http://precisao.org/files/files/19623662896.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364d7f4e6b6.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161459a80824a9---fovipapofagetasajibunutor.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/rit6g2cs375rde0cpf5c1igiel/vetemunetoguve.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/gukefijufabosovixobowuz.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/fowitotowejavavuxilod.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-24-21-35-26-42.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/modapojafaxexagapezik.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/37603774963.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06f0d61a3---lemapunupetuxilokim.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_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 17796 bytes
SHA-256: 3d4688304eb3ee3d109f2bec38fb94c857fe3ab92d52163cd0a2b816dd3c8b40
font_02_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 10132 bytes
SHA-256: 824d40b0ea29b5736a721d6449afa5c21a67110e5c0958b2d629fe8daa3ba901

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