Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6c1939a8e48531…

MALICIOUS

PDF

102.9 KB Created: 2021-07-24 17:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 336dfefc08338eb2759c12e74fefad25 SHA-1: 68b247d8585d5ed1defa0c8c0fc72c7f644ec8cd SHA-256: af6c1939a8e485310b25bb196dcb841bcbb91e80669685c869d5bfe8c640daba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gencerenerji.com/resimler/files/67484662206.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/danim.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/63503346587.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6985cfff0---xegulu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jnepn1hga2e8uh87vh4a551ldr/26009168758.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/460ab89f075123dd17c79c9adc7e5661/raruximejufuzo.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/lerunexusitokugoxejut.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/gogulawa.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/7ebb19302683d46fac5a944a1cdcd2da/49006135086.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/77147870316.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/xiroganurakijopuzetedate.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/27d22d7765cd247b3614fca86ddb8e3b/85662623927.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/273cee75df7c323bddfec1b133117ab4/medagudafobij.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4aeb509e49a74e4170373e0724c2c854/bujipujukawatulinek.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/22069069897.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bd63fd6f6e9e143c3a872634bb409b72/31966802762.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f98887b5ee6---85221238902.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a6762649---wozab.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/90068145943.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2ac20942a978c6d382cdd6899ae28165/59695160092.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d8168f32---69757482482.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/gitepalujolafut.pdfIn PDF document text
    • http://petrduchek.com/files/29189372686.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/44433485714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=is+terminator+2+on+netflixPDF link annotation
    • 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_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 10548 bytes
SHA-256: 01220a3119bab64f512be35d1cc8f07c7acf903a9e7ae6690b0b402426b8c921
font_01_sfnt_off00015330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B42 18204 bytes
SHA-256: 8907f8f8811c41157b2151536ab6fd3b4b61983c613f2e1b406793db94a78ffc

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