Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d37d73ceee9516a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 02:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b37dc00d2b85bcfd90a8d4aed853b9db SHA-1: 0c9d2de1f265c354e3311ab6f9b1846ba2c6b987 SHA-256: 3d37d73ceee9516a80eca54ee37f9f84e43b74f42aa82fd2836a22d117727f8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fubaxapotazoxutuw.pdf In PDF document text
    • http://papianiarch.it/userfiles/files/vobelo.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f6361507e4990c4b577130981c2d4c8c/ririg.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b2c4dee5f93525f1cd93aa94353de4a6/baxaxagaledezulawabozi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/or5n1g2ec6rmv33p7as5dp6bd7/manik.pdfIn PDF document text
    • http://whatdwellswithin.com/file/kubulodazox.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/68787888347.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ouqqmog2acc3nftivoc16dkl21/vakeredale.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/penobixokaj.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/91667327724.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/56580632772.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/zaruwifanigagu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c329932695e8878537cf4d7d15c65767/torabusixeju.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/k76v5do8phv0itm792f2qgkm17/dumuvofube.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/95661749287.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/75703859580.pdfIn PDF document text
    • http://aa-nusd.jp/mosipizalalebewusim.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/botunewesilizebazaren.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f926332674---36047102776.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/30230755732.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/venid.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/59059642606.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/zureluxanitasem.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff892a846c---99606593634.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/turapezejupajukivowawanok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=data+structures+and+algorithms+made+easy+in+java+pdf+githubPDF 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_off0000c1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BF 11620 bytes
SHA-256: 3e8c752dfe6ea090c56038bfbf0b9a7085a4b0c4750e40606dd6869bfbdaac97
font_01_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 20064 bytes
SHA-256: 4533bc9144d4265ce7e19ccf7d211ad4e9dd6c79af259391e001b924937b411c
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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