Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9a3bf6c8073822…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 07:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06ace94f458eb3a8f620aa90a7f2533a SHA-1: 23a8333af2727075b70f92a9e1eeaff8086eaba3 SHA-256: 0f9a3bf6c807382291dc5a3a103d6486828b4836e061ced5d21f2e7a79981d37
164 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 http://timnhanhonline.net/upload/files/padovotabuxaj.pdf In PDF document text
    • http://gmtshipping.com/attachment/file/panodoje.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/86612345470.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/25069124894.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/73610926163.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/31068370433.pdfIn PDF document text
    • http://iknow.pl/files/file/53810482714.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109112116274528.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cfea1ab98---mubijiguvapaximejeze.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/zukizimoputixugogo.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/3550591435.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/256b658b50cec01c12e850e356373e8f/niterapugarurodus.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/pawekogupemux.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f0706ad036a12806fff9a5fb52424c61/dewowilali.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/69200715798.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/fafik.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/lizerufelivusafaveluxo.pdfIn PDF document text
    • http://vodnik48.ru/content/file/74921172555.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/bevemafosomunalofujanem.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/56483998052.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/55459552402.pdfIn PDF document text
    • https://binhvi.com/upload/files/vapixoramika.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/fagatujefasovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jhalle+punjabi+movie+onlinePDF 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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 17072 bytes
SHA-256: 7bd9da1d560e734effb2a0b169435e862f78cad70b8a7bc09ac07a66b7badeaf
font_01_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 10580 bytes
SHA-256: 653053705817b44866d393c8f445bf8d365c46c0092842c2a0d027e30025b0df
font_02_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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