Malicious PDF — malware analysis report

Static analysis result for SHA-256 509791d045591dcb…

MALICIOUS

PDF

83.1 KB Created: 2021-06-26 16:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e6765c964436a4dff946034375a0f903 SHA-1: 8f551f11820d90a25f9280eb87fb7c64a7c3f00d SHA-256: 509791d045591dcbecd709dc0cc4ccac0a985e15e9f7c74bf3cd75f9cf9618d9
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the use of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160961a342359d---xijavomotirumedonoluwu.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc100b67a6---siresajedusajuzufubak.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/go7nmkf1d90qloahp79ks1mf94/nokujerogovejujesixe.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/55952944639.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bo9rm0djs7e4mvtap0qd4lta1m/nesobazezogefogabazu.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/gotasaxomawemekumoxodo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/650c13d0958430e694a0804a143037ed/63791215654.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/21611027746.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/55968354937.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/68236916063.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/lodimawox.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/48239513656.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bv024n2l24gmpf13a2nhploo40/14034069308.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/2abc51e27ab99b0356669b7127ea0b40/64901826774.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/gulepamuvuzidaselosaz.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/49408611440.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2e0f16c22137e8c9d9c969db0538c21b/gaxaxixirutu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/mdauukgvlgh8fsh6gbot1knjt9/73455714302.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99781e291---zenifefojosume.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609182f80ffc8---lonekozitili.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a37ee52b5---nokafowid.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/wigabosenup.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25218cbb0---2118937951.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/kodukaridezuxil.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/10003948771.pdfIn PDF document text
    • http://momsystem.ru/public/file/86169229109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=a+male+pig+is+called+whatPDF 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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 16212 bytes
SHA-256: 896ff83595b44cf6421991b2db11f04fd82d8bb5564ab0df1946da01a6efadcb
font_02_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 10704 bytes
SHA-256: 8b663c092d0683ef2a448ac621169135c230c6675dcac4abed991ecf2c68fb98

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