Malicious PDF — malware analysis report

Static analysis result for SHA-256 1befb72d40e3b5de…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 20:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc47b984a80ac095c8383f9f59b420fd SHA-1: 109c9377cbc4bb8359f8aa03c94a9b36f1936afe SHA-256: 1befb72d40e3b5def752f9db1892430ae14907d898579efbe30a1724baeb69d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for distributing malware or conducting phishing.

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 https://businessservicesuk.com/userfiles/file/24233174439.pdf In PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210707_E3B05D647A9BBC83.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c06e1a07547f7984aeb8b4fa6915a602/bajumaxevoxozenovit.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/wuboguj.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/s554fqb091e1jfhn08l470ps9q/98969299762.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75868c23dc---lojumaxisug.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/23044883910.pdfIn PDF document text
    • https://medius.sk/userfiles/file/35084816097.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/tewenutuvov.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/dixinomodi.pdfIn PDF document text
    • https://datajournonepal.org/files/sonuxakezot.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2367acec30---6598372307.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/95169327715.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/gosemavakelufi.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/mepuzes.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075cba8c1cad---rebategowafe.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085be1a47a97---61436358951.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/91673483017.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/tolutapubuwe.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/18634030301.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/felunimokenevudi.pdfIn PDF document text
    • http://susutour.com/userfile/file/61326247618.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0edc4018---18649668439.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/kowulenoxakisag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mahavatar+babaji+kriya+yoga+technique+pdfPDF 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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 17820 bytes
SHA-256: 6f455070a6d6de67aa4cbb98c47dc74229de9e75d66d8241b6066ac51e05b8f6
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 11464 bytes
SHA-256: 40406c94c1b98480b533b78083d8fd0f974edd80396c6e9de05d94ee8f4232d4
font_02_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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