Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ae16fc00988ad6…

MALICIOUS

PDF

75.0 KB Created: 2021-10-03 09:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1580b35952ece29ee692b26ed80cb685 SHA-1: 94de7c397e15fdd219a2ecf3e81d73401547bd57 SHA-256: 61ae16fc00988ad6821be4a6c50eec14e14ec243299046460e944a2757b09712
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://phongthuyphatloc.com/luutru/files/faguwavipevadep.pdf In PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/36361354301.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/nosemanusu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ba69d538---83343496174.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/85657731534.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/62358919737.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5064047e1---93981785669.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/rufix.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/mofefeze.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/97460899394.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af053a51eb---fakimafosuvid.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-18/20210918021056302619.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144e5370ccff---343982823.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/xudoze.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xumogimagizebinevupaxi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/bbvh86e14qlsbd4jekn9fb5juu/58889894969.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e9149ca7---19767425613.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/konexagafuduvivulapiw.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/1904272817.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/73434198117.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/20c2227cccf1f0c9d0e3545fc6817718/93426704857.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/zudepe.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/zojigojugeresomi.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/zofotagugakepu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613278950cc0c---30070711960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=p6t+ws+pro+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 2880 bytes
SHA-256: 0f8fe9a0be51dec011e21d36f67b22c1e5c9d91508daa0871c008c47d81ef3b4
font_01_sfnt_off0000bfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 18012 bytes
SHA-256: 102e1ab3818067fbbd34cdd096961ff8c0db37bdcf4bacef4831b1a2974bcf5d
font_03_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 10544 bytes
SHA-256: cb37b997b43c30c18cbe447682df66975ec8f2786ba0d0ed0f3fe4e3b57cf11a

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