Malicious PDF — malware analysis report

Static analysis result for SHA-256 5213552ec62f50b0…

MALICIOUS

PDF

112.1 KB Created: 2021-09-06 15:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a20aaf09991151fd8c998d07399258a SHA-1: 191de87b6e444095815d82ac4285c7a3b3f12e05 SHA-256: 5213552ec62f50b0e1f715cb6445078ffbe4ccd2d2b73de9d3155812f7fbdde6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=kent+beck+smalltalk+best+practice+patterns+pdf PDF link annotation
    • http://zimaletto.com/uploads/file/nagazalazugaka.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/72164031271.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b2b8740238bb088a380e87cd1319b3d3/gotadewujapo.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/88318439878.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/baxevazobubo.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/kajijisigax.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/49674938873.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9610ad92fc15fd7d606d95ab6834d323/zifolesikixerimuvejejewas.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/wowolu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086b947f01e3---timefulisijabasovakoguxi.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/dibirirobelobudamu.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/1997097594.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/luvemukudag.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/marupajeludeturur.pdfIn PDF document text
    • https://altbuket.ru/files/54968845034.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/0p7tkn8klpi987n6g5kf8qfe88/76777233546.pdfIn PDF document text
    • http://yejida.com/userfiles/file/ruwenufirafijulodapokoju.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/paxob.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/nofurejarunubaj.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/70741040979.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d886a80707---7438183197.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/33234222506.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9ac8f5595e74291bc7631de70b5c4dbd/sijedenudanata.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/pegexilarelavuzexoguwodaj.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/navabepirapoworupozamubab.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_off00014edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDC 10884 bytes
SHA-256: 715acf3ff383637dba9a9968c59e8347981b31c6a1c0aa0be672abd3abe3b895
font_01_sfnt_off000167c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C3 18312 bytes
SHA-256: f4365bb935b7103c1eb11b8a49a9d3c0a4ff9c462f95740482de8d8dbf00bc9b
font_02_sfnt_off0001980d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1980D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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