Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acf9ac440502f5a…

MALICIOUS

PDF

83.0 KB Created: 2021-07-08 00:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3dfec08f92e4966c931174ab345989e6 SHA-1: 735f698ef9f299eef385977d3f3b3ebf009289ab SHA-256: 1acf9ac440502f5ac84d08dcd2b7cf9b3513120395965c151acad9e9a96cceb4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' lure further supports a malicious intent, likely to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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://drafthe.ru/uplcv?utm_term=600d+canon+manual PDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8c9eba11f72b35623fc17279a5685cbd/87446972751.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xedavurumoriwonopajesido.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dcfd8079---97566297066.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8b74cf2090df4400a958ed8831375aba/sanegijunalinazidaf.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/53e8c1487e030bff0b4698bd8991ce8d/kivezanokinaroxuzulanipe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccdb63c3fc---latodegitovoguz.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/nunosajifewasokababuzak.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/wadewupifuzoduw.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0204a70b34---gemelan.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b3457eaf---76332044023.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee194b813e---94805114582.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/m76ae6j0t58og1jo4bp4bv1jm4/79701469215.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/daveragabi.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/ruxumexitifaguxakad.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/rometamowatududobuwelape.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/97024852ac7c80276531e286c3897303/23948291460.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e62993bf1---fapunexafor.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad305ef749---dedebenufutazaduw.pdfIn PDF document text
    • http://banquat.com/userfiles/files/wupimajosogi.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/sqkavbvokmjqbo9sjdc8tspbm1/nijodurubogedekovatizu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ad5e99e560e6326a6766c8e960378f3/rumukugikirukipularila.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9unvna5co6d00glrhffm5erefr/dixasu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf6f72b9d---90135816035.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_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 27352 bytes
SHA-256: 223b8beea78ddc149d223d37b6b1acfc9b5ad46e669ab112499d3bedf6ec0e2b
font_02_sfnt_off00012834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 10236 bytes
SHA-256: 518ae557dc444df7e6f978c01563b08c3655434c54b55c71dc177e6ad914af72

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