Malicious PDF — malware analysis report

Static analysis result for SHA-256 6230d82f36608150…

MALICIOUS

PDF

101.1 KB Created: 2021-08-13 18:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4795334da5b26821460552b9c507e202 SHA-1: f34451ecb09e553b854aa42c9fb9c277882ef213 SHA-256: 6230d82f36608150eb12141b3625b32386c44ebe69d26262e2523738322f9255
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: 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 uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic indicate an attempt to exploit user interaction via embedded links, likely leading to further malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sarlampa.ru/upload_picture/letavudewitezowisavuje.pdf In PDF document text
    • http://dichvubaove.online/upload/files/79291518446.pdfIn PDF document text
    • http://qca.ch/userfiles/file/84860714998.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/dizetoxalojirakinabobamuw.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/27310785833.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ee9e2361---jipalofareko.pdfIn PDF document text
    • http://mutitar.com/user_img/files/61874035437.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/dixijigifozavumejukoxoji.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/41812428453.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/buwigikixome.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/13011277279.pdfIn PDF document text
    • http://lucann.com/Upload/file/daxogejidexujizu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2306f2cec4---30595139225.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/74676177746.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/77ea03aae200aeb950fbe5439d63eb54/90417750621.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/54qivq7h0fnmt18jrfdqa948q2/79687649344.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16251393521034.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75dff3d38---ratufufam.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/19ac99d678d0d0fde83abd72af7344f4/lipiposeba.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/desezenez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=analyzing+genetic+data+worksheet+answer+keyPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/tiliruwabatewuvedipu.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_off00012514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2B 10984 bytes
SHA-256: 86ebc406f5a4e96a08dfcb9942186f8c4f60401e69162b7fb6385a73bd1bf7a1
font_02_sfnt_off00015692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15692 18028 bytes
SHA-256: 86fb530f630415f3d45c2a956002384c93d3ba0806cd23661899748f2003be1e

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