Malicious PDF — malware analysis report

Static analysis result for SHA-256 606696a2171faebf…

MALICIOUS

PDF

78.2 KB Created: 2021-09-28 04:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b20378227045686843f9a376646ff78 SHA-1: 16792ac06fa685c8ae85f8851a438f3850ba0902 SHA-256: 606696a2171faebf02d708352bc2f2e74ebac4adc2a75f610297e6ff009c5ff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=tolkien+letters+from+father+christmas+pdf PDF link annotation
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8db942b2---51646781443.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909031010.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/47778322383.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/gobubivodalub.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dca981524---29431614131.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/78504413429.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zogitodejub.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7c4462c4---sizivulow.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/30653372495.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/27778260362.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/vuripi.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/taxerafolawusixana.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/varelemajabujuzedusakumes.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/lukofuvojewewosegenepepe.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/xavos.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/08c773ad43006a992cb1ffd947ec913f/buvegevafosividomikilopo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615244f71ebaa---pigojovemi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/28522118633.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/96219986977.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/mefolabolagekuvanupujedan.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/kapijoxi.pdfIn PDF document text
    • http://imbirimbir.ru/files/sijagarimejelumaxaseb.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/jikedadazorimigamovudux.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902165630.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3adf031e43a5ff73f5dd0aa940ad5830/42272578794.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/64930176382.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_off0000bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 22892 bytes
SHA-256: 5b92083712c283f047ab17976250537d11dfdfa2de79e47b1fd89b6b4d384d92
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10940 bytes
SHA-256: 75a6e88bc05d1dabaf0d052dbc9604d174f127c6dd03cc5474c43c6de810c990
font_02_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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