Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1f0287e2deac64…

MALICIOUS

PDF

75.8 KB Created: 2021-08-02 02:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf87bfe6c44e51cd7659afd7be49cccc SHA-1: 654dd4cd0e47b2ab7a4f7af951c0597c426e218f SHA-256: 7e1f0287e2deac6408fbdcbac7bb24b8803d1aec399a4fe824780d33464f485d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malware or leading users to phishing sites. No scripts were extracted, but the overall structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=how+to+find+moles+of+h2o2 PDF link annotation
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/73263644542.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/mobifibemibitepeb.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609485f7797e1---razutitulaxuwabe.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/topuduzewazafogi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf4a4e6e2c---vanifipulupekezobipikep.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a251124f54---66772265159.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/42d4ecc3d68301f57047bd1f0bc46df6/jidazexiziv.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/67665617756.pdfIn PDF document text
    • http://darec.sk/files/files/20874530046.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/tidufovadadabizagokejak.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/135351039.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e1b72c3c---jozowaniw.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/lakazujozekenopufuronotut.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xitefavuvigebibevike.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/79776094409.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/47787933933.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/vegorovevubaxowiwoxexug.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/xexapunesiraxakadexujepu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa98a91d7ff---51032786808.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/lasijovovesixoxuposegefit.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/eb07ec28976c3bce22cc263a52cb870b/34978804090.pdfIn PDF document text
    • https://zzwgjx.com/d/files/vosas.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/gupuxepozorakofufunevu.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/rasezububalavi.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_off0000c543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC543 16852 bytes
SHA-256: 0ef5729d5681046f56e95a94028b541cfcab94a2371335088bd3b03fa5ba8990
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10556 bytes
SHA-256: f437221a80c7c5f836a09e400483fb1f9543160ffbe05c424c492bdf910b8c9f
font_02_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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