Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d0c761bd5f6874…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 19:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2914948af2142ec6d1dbae1650b79848 SHA-1: e9edd546d5e648b472fd13ac0f5767a41b62b170 SHA-256: 15d0c761bd5f687408853bedfaf46caf8d5a64791347aac832cbfb056228f80f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=discrete+and+continuous+distributions+pdf PDF link annotation
    • https://bnovum.hu/downloads/puvowuxizupovopovimigamu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4191ae0917.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/pumisu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9ec4fd88---gikinefudisurupizixoj.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/25494492998.pdfIn PDF document text
    • http://goref.ru/files/file/xelewusokugonenozazixegel.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/87540296621.pdfIn PDF document text
    • http://juentai.com/userfiles/files/58281296918.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210905045414.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/643281824.pdfIn PDF document text
    • https://okvino.it/file/jajapow.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/64314119264.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca6ce59d5---8843798643.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/toxosezisitipatufad.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/zuxazuxekawotox.pdfIn PDF document text
    • http://temple.mo/userfiles/file/folivijobomorivuputataxu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18399829f---xofegofadojoxug.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/lejisukipadegaxejifejilaw.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6fe0b381c---1131952809.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef34404e4---vogexobesis.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/ganuxaramugik.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ddd22bcf---19670983331.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/84672367600.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/rasitirowalujogegopomusav.pdfIn PDF document text
    • 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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 18504 bytes
SHA-256: cf0c48ad5449abcb93203234e15e2c15dbf137779efe98c4ff3ce7c4b904f566
font_02_sfnt_off00013a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A52 10808 bytes
SHA-256: e8234bd5876a726fa378d004c32d87949245ba7712290be44737b66618864d99

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