Malicious PDF — malware analysis report

Static analysis result for SHA-256 b343f4c18652aab6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 04:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 172f2474f21dc4458fbce5835df6cfc5 SHA-1: f71e36fea22736d53b34ed0dae01c5e9135cc1d3 SHA-256: b343f4c18652aab693a64acd0c88b0f6b0ee399ada5ef40a6facacd6cc52e077
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=silent+hill+ps1+iso PDF link annotation
    • https://narellesastro.com/userfiles/files/18099009009.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfa56375e---27025624049.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/56541382746.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/tapexilapux.pdfIn PDF document text
    • http://africareview.in/userfiles/file/55514009357.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a08b8239c---pigurunotosodasulerapen.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa78f2a23---sadedapelivekugurin.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/8458849329.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/7650372039.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141c66a932f6---97702368250.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/godinapizaxorobulofevoba.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/13544831780.pdfIn PDF document text
    • http://anninh247.info/upload/files/10711234876.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/b8dc6d456b9a9e60052118291fbfd7db/rapudedapimexadupuzoriz.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/vetajaduturonedovibopo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc564e8ab5---mavugisujojifez.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/nuzewupixozavutoxejazat.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/vezulasonoti.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/genofo.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/41819879688.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/bomotezala.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/juwuji.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/50703910175.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/74845080726.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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 18544 bytes
SHA-256: b59e1400f615341cb945ca14ebad410974bf3728eda7e7d6c9711e0ded6b75fa
font_02_sfnt_off0001249a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 10212 bytes
SHA-256: 03b95ae6dac6102cf4a7b1eb2a4c4d0cf61f18611b5d11b64500aacb64c26ed7

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