Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f9e0f8c15e7c62…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 04:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1e8a3008f0655734e7004fea5259387 SHA-1: 493ba5efcca09e240f16016e3c8402db9a2791a9 SHA-256: 28f9e0f8c15e7c6262b8c29b9e3db0270cd76ab4e09e0c36271cc4a40bea3bf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent, likely phishing or malware delivery. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://infrive.ru/uplcv?utm_term=osu+game+apk PDF link annotation
    • http://myarrahnu.com/mo_images/files/zolopuwajov.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/76423575301.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/71405eb43a52e75243f725ce65c0673a/38889244176.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/48338058458.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/87508046533.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/pusetaj.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/lifenuwewoxovewejemapozum.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/66647692025.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/vuxapozididixut.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/subilewololodavanijinurer.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vimejerodutikuv.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/19861936527.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/vifanabalusebovoli.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/pexesilomoligipavip.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/49046287688.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a458538af3---lesefavetitusowuto.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/55030119410.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/diwekidifabivobep.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/63289707564.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/rawazaxuvem.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/pajupiwepaj.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/vazezitem.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e209b04593---47785014678.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/pejafutakudoliwoni.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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 17320 bytes
SHA-256: 0ed3052d358bd98a6d69defe2c9c0ac09f42013040b05b02242508551a9fa5d7
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 10252 bytes
SHA-256: 745ea94de4d77107666edaa6c3045ee3154b76b76789a413528cba25b7bc4ddc

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