Malicious PDF — malware analysis report

Static analysis result for SHA-256 638f63eb1c9572a3…

MALICIOUS

PDF

90.4 KB Created: 2021-08-21 23:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d959e6295d47d72c38ce80e7d74028f SHA-1: c238f949270cd788626c5315ede61b970e6b8990 SHA-256: 638f63eb1c9572a3354f5275dd06ef72ec31ac1827918873f92e3b6da8ba82a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download of a second-stage payload from one of the embedded URLs. No scripts were extracted, but the PDF structure itself is designed to facilitate the download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://oniceh.ru/uplcv?utm_term=how+long+do+you+have+to+pass+the+nremt PDF link annotation
    • http://meadescafe.com/userfiles/file/worusu.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/xelijokelemumosid.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/43d5ee02ff53695aa935902bc64abcb2/nujitevosul.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa8a14272---baxoz.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ezigewexuloful.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113ac5307cb5---sowijagafamiwodoj.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zowaxinepe.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/fulabewopevaxo.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/xutedakamagoj.pdfIn PDF document text
    • https://digireg.si/upload/20350188331.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a27f201006---xolubusunujas.pdfIn PDF document text
    • https://unosms.us/userfiles/file/kepafeb.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/5324383290.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/16662649751.pdfIn PDF document text
    • http://dentherapia.hu/files/file/49323785035.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/af0ecbaf4d7c14c0b153f0d67bb8f001/rulabimi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c48296029ec---48918915602.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l671pt21r27c1jgstplqbfgs82/18311078960.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/38334720632.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/lpi5q1l8dgpbe7htnmi8e77u77/84217597407.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/70514449718.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/mefonopeg.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xijujarixar.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/40459133386.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/46063902229.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/afa3c7b255186c9a25774b9e6dead502/takeb.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_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 11104 bytes
SHA-256: 6c1646489109a98757b3d44b1f0a5e5817a45d732fb14c92180260354f51155c
font_01_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 16848 bytes
SHA-256: 626e49c79cbd8bd9abd80a67009d815ffe669b1b7b16ff861bdb7ee641e1d139

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