Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc8a264ab9b1e3c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 04:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdd8f06040fd5106ef11444e2952b9e0 SHA-1: 7e3a95fbe07b79d9cdcb6ab3f7452266676aed01 SHA-256: 0fc8a264ab9b1e3c9b65be40d943059e9e5b5e44a9f00b53fe915e4f9f373609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The presence of these links suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

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 https://gifarlcm.com/upfiles/editor/files/kiluwutexemerifevo.pdf In PDF document text
    • http://belv.ru/userfiles/file/zuxipadirotolex.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/xuvedubedomepukop.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/nakatakudabebal.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161455afe33b01---fojemalizovaxetubaponap.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/67381179109.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/10149161151.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/wemolapukedaposotiwok.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/73642129923.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/wilizug.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/48092634402.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/bixokupesuvojexodiwenazi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ded757e9759466f410037061b42c0f63/luwasezuxawamazavel.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/94527799943.pdfIn PDF document text
    • https://onecre.com/images/content/files/65835260004.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/80386958872.pdfIn PDF document text
    • https://promise-land.com/upload/file/vuzifevobelemazokobajosu.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219141148114046.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/zozotuwisadonenemajij.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/36155699335.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/58736365535.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/jipid.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/betojebitudiladekanen.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1s9n72gl5qtk1a3sh43oqqh0cs/61494103984.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tamukofakibep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=extreme+car+driving+simulator+new+update+2021PDF 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_off0000c300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC300 19732 bytes
SHA-256: 5c71ff36c0176f8442d11b82e006bab39618d877c39562522a915d1f3f8b850e
font_01_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 11488 bytes
SHA-256: f4fdd85642ddb9a4c7b4a9c9a6b883ed410347c6bb0fe62afe284dee3135c293

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