Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafcb28287637d83…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 11:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc0c5bd77b4e596df49d6bf6494b3299 SHA-1: 88c05483848db18094ea3b92b58fe6748cd48f62 SHA-256: fafcb28287637d83e0de9683822dc5a9c83ac44f1dc32c6fd35d70e8c75bc454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the final destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage compromised websites for hosting malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=smart+card+maker+apk PDF link annotation
    • http://focalthai.com/file_media/file_image/file/71906835203.pdfIn PDF document text
    • http://fourfoods.com/images/files/zatezarejuletun.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/bojopuwup.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/buvonipigiwo.pdfIn PDF document text
    • http://p-energo.ru/content/file/73628305900.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4uidb38n5v6t24tqsr91ubp15k/vujiginunebinamewonumolu.pdfIn PDF document text
    • http://kotolantopeni.cz/file/jixanexegasiku.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/88207369353.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/41538996776.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/jibufomejojerukumidi.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lerugimo.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/11969763332.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/damaxezeril.pdfIn PDF document text
    • http://kustari.net/userfiles/file/77159792113.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/vilonozexoti.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630951680xirepedapib.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/38647171523.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2453c90dc6d84fa06a698fa6dc8f2e53/kusirorutezuritavuwilepas.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb8b1220c---xiboselim.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/69053525039.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/96649167288.pdfIn PDF document text
    • https://clinicscrm.com/img/files/fuxonavupix.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/domapinobifa.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/65883359804.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/97967949900.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/dedifis.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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 20864 bytes
SHA-256: 173a3132b98170801bf687d46b123220c3072808233cc7bd321693def30eac7f
font_01_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 10312 bytes
SHA-256: bb111dbf975a598e11146fd62514895886ecb63e6fd192b2827fea3f6d038a92
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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