Malicious PDF — malware analysis report

Static analysis result for SHA-256 a214136fa195e0ed…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 09:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4bea0b4e6fa1a227a9614619b46def03 SHA-1: 96697da38c18abe6a5ea0acc97a8ebc4315119a6 SHA-256: a214136fa195e0ede63788f8e16c06820a445fd8e1ca27841b4df65fc6d023eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://iaestedresden.de/userfiles/file/43192366118.pdf In PDF document text
    • http://studiosantese.eu/userfiles/files/penifulowolusuviworufavev.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/93200486742.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/80655089281.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/segawu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5245cba82---nejegexabonexuz.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f112da82---nezuwokabavojizufawevujok.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608101d443252---22674676773.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/28953790672.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/matupumesijekiwolobibiv.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/96007039219.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/3904740585.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/kiwosodus.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f67f580f80e---55176801048.pdfIn PDF document text
    • http://xn----8sbosgn1al9i.xn--p1ai/ckfinder/userfiles/files/lutig.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7e02032f---wagiwevokuvatekuluwosevaf.pdfIn PDF document text
    • http://hkalc.com/userfiles/59949543922.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/kenamevure.pdfIn PDF document text
    • https://master-service.ro/images/file/35125585297.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/wogokupowufuzorusilap.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/jotefusifibel.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6224a3fce9---78688306833.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8e8c9b275f70e5b0e2ce95285c8a7917/15042519483.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/fqlc32971grh761uf971m1rk71/navoruramotop.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/mejegite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=signal+processing+techniques+pdfPDF link annotation
    • 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_off0000b5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 11220 bytes
SHA-256: 9e22265b03916e1c312dedcd9d98e8cfd4577cb1e40555b930f4bac0ea5a0d20
font_02_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 14688 bytes
SHA-256: 455b33bbcad9ab296c46a190aab871d266265d0b437e5efcc4f78233f5d5934d

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