Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2b7a7162b59855…

MALICIOUS

PDF

78.6 KB Created: 2021-06-26 15:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f91ac5ebf1a6613da830766ae7645445 SHA-1: fbce2a28746a56b948f16c64db1a2c3e70478942 SHA-256: bd2b7a7162b59855093a75976c65e64f7e64868e1d1abf06fa58b01f847337bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=how+to+clean+toner+drum PDF link annotation
    • http://challendor.com/fckeditor/upload/file/kamogafazefinonopuwor.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1289886244184340696b1ed3231187f1/texenenenujopefozabobo.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/25512359973.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79c2418b6---63847350853.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/bco2mhjudhife9bnf9kt0tjug5/74096027209.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/80388338019.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/adb555d45659fe891ade5d30ac9d71ef/11460693993.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/82774974271.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/vekataganak.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/26813351828.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/26524720463.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719a3873fce---fitazot.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/likud.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/92671824825.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/85099130058.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/58865596511.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/bowifesaribedos.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/68418355777.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/lnboib4j6bcveu5vprrj48n56b/xipize.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608c492057f0f---47430887070.pdfIn PDF document text
    • http://dakmet.pl/upload/5525411898.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/goloduvefitesusig.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_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 10448 bytes
SHA-256: 25708280d622e654a46fa2529d67d51105208476246dba8212a8651897816b94
font_01_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 17008 bytes
SHA-256: 54bf148beee4e51fe1d751bfb09ff17469664605bcb2f03c46e7e232544b533b
font_02_sfnt_off00011547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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