Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fe03235bedbac2…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 02:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfb3a0575dc0393fea0984b39bfbe9a0 SHA-1: c3abacef79c5b54de2ed38d9aff8258743d8f09a SHA-256: 50fe03235bedbac23f87f5d0a94c3ab1932d2b243f5c7e2a23d046f48a429277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=literature+review+discussion+example
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074a44388f97---baselinud.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/0hpu6cs07p9559b6ns0m1pd2fq/bofotemakodolewo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094789edb708---17737787346.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609825f53afe6---76742966799.pdf
    • http://trendybiz.in/usersfiles/file/manaxogetumeto.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f0f10510---97134666278.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8e104484f5f9b62c3df1fccc5e9b6bea/58519776062.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a577507b01---dowetomafa.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b91ba1a83---71412091281.pdf
    • http://kiavysocina.cz/UserFiles/File/66217731460.pdf
    • https://steklo-shik.ru/userfiles/file/85406207003.pdf
    • https://dolaodong.com/userfiles/file/vexenulamepunarexire.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1c98b0b9---jikawabupuvosonu.pdf
    • http://tz5168.com/uploadfile/image/2021/06/10/file/20210610_105109_127.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4f2abf58f55491ffe5c115ab630cd249/92421487426.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608808946de46---tiwiwevaxa.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9b985a0c30f88d88b6e9befe5552cf07/fisudop.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7128301ae28cbfa4fc685da62939de30/33535733287.pdf
    • https://agrilaui.com/userfiles/file/46671231610.pdf
    • http://auxerretv.com/content/public/file/19461958822.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/5de69f344a3edfbfedab0c992bf9776e/xopaxiwuferoxafa.pdf
    • http://studiorinaldibedin.eu/userfiles/files/xagusasomelarelojel.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lj7rtmh0pcl2f7a2rtti7cv8d2/pidek.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f75e3711c31390da466f4def3b8fe902/wijogow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f445.bin
ca9ebc8511fa7e61a2d5c222f7e49bb7fe26bcdf56ada1fd521f91ff6f682f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 16500 bytes
font_01_sfnt_off00011f1e.bin
8024ef30ae22d8b96c1a8b4d3a54a02d6dcae44b64d95e1a47ba6ddd2a75f089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 10988 bytes
font_02_sfnt_off000138aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 16792 bytes

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