Malicious PDF — malware analysis report

Static analysis result for SHA-256 f565cca13d37ab23…

MALICIOUS

PDF

100.2 KB Created: 2021-09-13 13:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea1e646103e536d0f6e7636bfe90f17b SHA-1: 4fe5ce208565faac70c912a6ae441a05313ec34e SHA-256: f565cca13d37ab23e23dfc44efde451a5c962756ebde5122b2e3d22874b052d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the structure and URL patterns are consistent with a link farm used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.enredmail.com/templates/files/idCliente_/file/mifebuderover.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f4ea33fd---netupekibelovukarovu.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/fusitanuvilegekapaleterep.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/juvakerod.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gidoxatovofozunadeb.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/gazon.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/41394105663.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/pixuxejexewixalolad.pdfIn PDF document text
    • http://hmed.vn/upload/files/78515526728.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/86742779462.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/669d4548f54b1a217a539873f00dc9c0/49035054002.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/ritugaxesomonirerusemajoz.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/xaruvu.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/38144622041.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/fusubibabawitovago.pdfIn PDF document text
    • http://unseretochter.com/images/file/varuveliripiraxesevu.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/4581035446.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/gakifem.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf6ad7ce6---giwesevadexekem.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350d3c9254f---womupoxaseterodine.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/javoboxamudoposarefuzig.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/31706375591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mcdonald%27s+monopoly+rare+pieces+2016PDF 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_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 11180 bytes
SHA-256: 11ddb6f9fe3406149b48c816a2130d7a74037962f900bc63f848b18d10ca2285
font_01_sfnt_off00013046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13046 21536 bytes
SHA-256: d929ff5176a3cfc5945143e963030ddc61e87a37510f8341874dcc67c0894842
font_02_sfnt_off00016950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1