Malicious PDF — malware analysis report

Static analysis result for SHA-256 c611c718b19863e5…

MALICIOUS

PDF

93.4 KB Created: 2021-07-29 20:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: db1d48e785ad74938dbbefcd6ce54cbe SHA-1: fb344dd87dae06af0192a832160397117c5611e6 SHA-256: c611c718b19863e5773a13ae35f0f86a85a538cdcc76fdb84cb086d9962a9adc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URIs pointing to compromised WordPress installations and other disposable hosting sites. These links likely lead to further malicious content, such as phishing pages or additional malware payloads. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gites-les-bardots.com/userfiles/file/vajiwufiwugo.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff8fe2d14---wojipimusetul.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c2c9c4fb20d6e5edcca1d9384a7f655c/95776282753.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cab5c31f7---rijakuxajuximotevefem.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a8cd53f4a---jizosomogukufedodemate.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6318b2df5---piwetutilobedagar.pdfPDF link annotation
    • http://architettorobertafasola.eu/userfiles/files/tenopunidej.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/de948906dd97c2cd2ccf03fc571a2e98/95224326726.pdfIn PDF document text
    • https://ottopianos.nl/files/vobama.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ed34dd42---33568538384.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f7df3463---ziwimekutekasuzelox.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750ae3e0006---kowakezudop.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f386f41a2---78176247879.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/79438154771.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15325555838.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d507635e9a---16752889742.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9077087669---zolegupe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4c5a598e883e1299d8cf59f5702dc9a7/donetinijixexafataja.pdfIn PDF document text
    • https://ecoretras.com/file/73374015059.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2ed841ab---wixuzegum.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/88535274263.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c30bf66140e---62974903973.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/83512372974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=last+shelter+survival+farmer+class+guidePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 10824 bytes
SHA-256: 6e7e0092c74c414aab08ca15069a3e21b7d665803879075862d682dfdf6d52d3
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
font_02_sfnt_off00012099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 17260 bytes
SHA-256: 2349d32880193a8c8c8c92ba71f2ba40258588294be7b1682c6c802405a771d9
font_03_sfnt_off00014d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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