Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fa6f80d031c170…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 15:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7dffcc314def569e4e65bab36df14089 SHA-1: 14b493aec206909565330e0a1d8ce561dc423535 SHA-256: 20fa6f80d031c170c773a9cd17f413748a5108af0fe7048e0766e21aee29a85a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URIs were extracted, pointing to domains that are either disposable or compromised, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous links to other PDFs on potentially malicious domains strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=im+yours+ukulele+pdf PDF link annotation
    • http://burelomdo.com/ckfinder/userfiles/files/56870708854.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139990668cf8---27668745604.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/85230929905.pdfIn PDF document text
    • https://people11people.com/uploads/File/vunusawufipelo.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hphfpoif4avktoj206dt2u9hqb/94501723540.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nhn299oj3u9kjma51uhlct9jkh/84886198453.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903225157.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/todulete.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/59932733320.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/48768147139.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137dbea4ed5d---60190748844.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/sapajemivukewed.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/58252443411.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/88619304557.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/28719495047.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/mijuvu.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/50668302938.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/kopegogepuvisubo.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/rujanisoxetijubapewu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613050370ce43---mofesowijalewatega.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/ruzefuxemunenutipumawa.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/raxavunojepilozimulab.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109082145064875.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/44958657569.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/df5cd8f30c90aa0705595ff427e7b135/13691985374.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/83926551897.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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 18384 bytes
SHA-256: 78553e6a58f044dc7ae5e456241f4a25d9f29eb1fa98a07f0220dc130f04001a
font_01_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 10460 bytes
SHA-256: 7289f8ff6e2bbfdd2573a8baa2cde0a0c6920f99f8de078fc53aaf9baae57952
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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