Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f5e58814d8d6de…

MALICIOUS

PDF

81.1 KB Created: 2021-08-07 11:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7810a30656017b9f13a044336dfd8715 SHA-1: 145ea55bdedfe6f0ca0a5030aff1d5bd5546be2b SHA-256: f5f5e58814d8d6de0787e677ace3db5910b4dd38d006a2b16430a02d5b68dbef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or to host phishing content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160cb07f200d43---54458435591.pdf In PDF document text
    • http://cecev.com/stockages/files/tojusubavak.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7dbb89ad05---92484211270.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0e89aeebfb1f03e9b1b7ec115714ae09/64373588600.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/8q97f8qbglbse8p013nnktjqhu/28452660494.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/fositafobutojuw.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///bikifepugiropalorew.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/96629902978.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4cc24249---95234079871.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/23391176277.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/4913247833.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/47705414273.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/59167928923.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62b8e0636---wixivodan.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5bd69f0a4b3928dc9793dbf53d6f0e35/18975109960.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/9817502208.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a3480d8d523e7c7adf70431360be97ea/nerisabokunomojala.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a90cc2aca681c2503b7fb6e8d068bd23/59055476995.pdfIn PDF document text
    • http://lawngo.net/fckfiles/25328790042.pdfIn PDF document text
    • https://angkagenap.com/contents//files/94327946724.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096715720a82---zonijorevepu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607628a6308b4---nepunus.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991dc3bc28---23362726890.pdfIn PDF document text
    • http://hrudolf.com/userfiles/logize.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2080b412---wobigomekoviwuwatejumajar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mini+dapple+dachshund+puppies+for+sale+australiaPDF 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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 10812 bytes
SHA-256: fbb2b50ccf09a3d2c5ab4fd0d899903398fc3106c190449b3543a951e46b3aff
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 17548 bytes
SHA-256: 49dc29b6e2196099557b26f774770b542a2276a438f7a5692448fabe4cd08e21
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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