Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a398bf23a294b6…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 04:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75680a5d6eda671f2f56076c1bac825d SHA-1: d26d8bc3a925253e30b0621fd3d7bacf0492ebf0 SHA-256: f1a398bf23a294b6a15eac44b683724c1c60d21cc5f3c0e15cf7b140553851b1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the link farm nature is clear from the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=hardest+alphabet+to+learn PDF link annotation
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/porowedafan.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/73279955200.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/pekigupatugipovuradinatek.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/02ef1fff67f21233dfa906c4455caa51/71044254050.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148708639708---sunerixefewo.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/vetatosajabupitukuzikej.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/46504167817.pdfIn PDF document text
    • http://apsons.eu/files/file/23027399620.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/76994570439.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/53225555715.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/revusifitidukibiratolo.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/11358949398.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec2820f568---37760892926.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/demarurunutufozifel.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jeronanawuvilasudixive.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/20283178390.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/43958322021.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/nipizeduvabegomisaxig.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/zefunatemanugusipel.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/jamorabodadulu.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/78036361269.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/40246503334.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tuzogexikuluzadoves.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462622a3f91---90967521281.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_off0000b01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01E 10528 bytes
SHA-256: ffd01c58b692ea1e21eb0304f143679a24bf78084f19d05083631e2fa15a3f21
font_01_sfnt_off0000c7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 15284 bytes
SHA-256: ff1f6f312deb4bce335aa17d66ef559b503d4c449725bd2b2472dd87e7d83043

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