Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d0472dfdca3a81…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 09:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 06ad69dce1737f47f91b221902cc2cd6 SHA-1: 45bda2e3573e1aeb27542c7e935abc6a21d4ddf6 SHA-256: 67d0472dfdca3a8153337a85db097922d1406a5ef8ee9612b67e9c826c9495e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for SEO poisoning or to direct users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160888d6f57980---60126802864.pdf In PDF document text
    • http://beijingbeat.com/contents//files/74025547031.pdfIn PDF document text
    • http://valeneighbors.com/userimages/26952035709.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/73842700380.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/61925641823.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/073f1adb0512f3571e98c169318d2d74/41850395768.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/jarawadozidanitabewowegar.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa9e6a50e---xuxavekenukerifarozonaju.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/giladiwupor.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/gojewitoridixiwun.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/nogenivuxuru.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/jegidubufogef.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160835f4290948---77356887466.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/83240376438.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/nrkn743j6r1ug2onn2l8r002hs/62711324632.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c864ad9d8712f38fe0b12b7280409f70/98852873448.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/wabagiguf.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/86082922889.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8d1dc8570be3202eff2bfbb798e028d1/68845063907.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/95880247585.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/mogelil.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210608233541.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gvek2k7c661gami61vnnib0ddp/poson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kayarian+ng+pang-uri+worksheet+grade+6PDF 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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 11208 bytes
SHA-256: df28c6be8c6d25d3bb9bca14ec85dd8079a5fd762f72d61819203717f2ded36d
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 17012 bytes
SHA-256: 9b9c5e74d1fa947537d111a4b6d38d655f32d017be724a547758ca69f416ae1d
font_02_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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