Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09a9bbb8daeb509…

MALICIOUS

PDF

80.8 KB Created: 2021-07-08 20:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f25004bcae700b858189755582d7f73b SHA-1: 16357343bcbb25224751a21c6cc55916d7064f86 SHA-256: e09a9bbb8daeb5092a25473cf3bc1a3acb500f9e63e6c490b7d3d383afbe2e0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment as the likely attack pattern, aiming to redirect users to malicious content.

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://ketchas.ru/uplcv?utm_term=how+computer+processor+works PDF link annotation
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac838ab74fb---77790885986.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/diwiwoxozozebaxegopudel.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/58fc23ba792e5b3bdae581ac35e4b603/wesufiravosevimudabi.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/bexepupere.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3cl2r2vl57c9202qjrormomifb/94417402948.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a6931ba6de9649c6aa36a7c06ee0cb5d/dobal.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/rosaw.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/sifutotiwirab.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/add2c21fd24e247ce67432f3fea86663/nutefegaxelorolup.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/43353314027.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/17087706192.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160818ed73fdf5---72619717517.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/93729f6258491fd8bc90c597836662e2/kujopukanesufokuromiso.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/mjob3sg2pdaf03r5832sm46qen/50038009848.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/jirodadegoxotodikat.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cf13d9e5bef87ca80b7f6c1c0c8aeb5/nimitudojun.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m4nt9ac1e2muhrd65i3i3pd2r6/82930360763.pdfIn PDF document text
    • http://funperm.ru/content/file/murif.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7844be628---932693156.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/kaguzitumazor.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/84994144919.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/miwub.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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 17008 bytes
SHA-256: c2afa29aa53cffb04b8d4d4f6b657e9d5a89642a92c47fbee523c916fccc1a67
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 10400 bytes
SHA-256: fad7ef7a5e6629330ace0d5c899dd9a9eaf32341b3830ac54173d8ad8b5000e0

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