Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f798913f1f745e…

MALICIOUS

PDF

75.2 KB Created: 2021-08-29 01:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d426682ba4e9c2bdce6ae66fc625ba6 SHA-1: a028c60c45ed3571792a3610e4811131638c3b1a SHA-256: 05f798913f1f745ec9d9da58574b5d3af64e007a5edd26ffb817da66baa2c746
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or phishing lures. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of redirecting users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1650e7943c---pimefuvavuvamewitotudimul.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/32960538614.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4d8d60vskfbbdj22vadem2tdh5/62214213985.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/47749049158.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/gbr1ge352652dsgkt21h2cf0o7/20081513713.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/somija.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/50008226255.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jobitoselisemulom.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217f3510a95---jupajakegi.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d12e28b2---62170853065.pdfIn PDF document text
    • http://bienbao.net/uploads/files/xorivaxoxexanadone.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1627752749.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/nupavod.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/sukadobofedigitevukuli.pdfIn PDF document text
    • https://actsonics.com/uploads//files/202108090644586596.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/pekozadesinodedurilusereb.pdfIn PDF document text
    • http://dmkert.hu/files/file/vatimes.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6fa9bd62---57526248204.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a756a95b---funuvise.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/zudigitinifuv.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5b6f96d8a---41581972006.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a41cdd0917---pidinavebikutugekofidoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hoagie+on+halstedPDF 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_off0000c337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 10420 bytes
SHA-256: e5da98248d6b0eae9edac23987aad71ed1ebc84206dd45c50aa9165a44f5e694
font_02_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 17156 bytes
SHA-256: bc84e97980e02852c019fe25398bcc654aa9c95ffca2e6140feb4d53c75475d8

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