Malicious PDF — malware analysis report

Static analysis result for SHA-256 766ae9da66586883…

MALICIOUS

PDF

89.2 KB Created: 2021-07-31 02:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9dccf3f5bfc19c8d645d2c8e94c54fae SHA-1: 4937df50dd4b19cb5918011a4991001cc7425c4f SHA-256: 766ae9da6658688387443735d85cc6b53ee57d475dc1f102b5aefd2ef621ee04
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be junk data, providing no direct clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=chal+mera+putt+punjabi+movie+download+okpunjab PDF link annotation
    • https://aviseco.ro/userfiles/file/3810834709.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/21799685218.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/wimibelomudedet.pdfIn PDF document text
    • http://darec.sk/files/files/xogimeg.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/rafuvizenizobinorabi.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/2575080011.pdfIn PDF document text
    • https://nevisnews.com/userfiles/bisugabanavaduf.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc0ca2a180---xixitelofixamarazarabati.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb42ca31d---vuzesi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/df2e10ebb88e4816639049e2890059a4/86570727324.pdfIn PDF document text
    • http://18554080.com/userfiles/file/29040374341.pdfIn PDF document text
    • http://www.moyekolodin.com/files/ruriwotirenikozonuni.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/zobijezuzopapevafa.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/weletunelo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/455648606a8f5c437cee94c99b0a428f/duboxibozavujamanoxilari.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1100c7597---tugiwikifazukusesepiga.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/tumokunube.pdfIn PDF document text
    • https://elitediesel.com.br/ckeditor/ckfinder/userfiles/files/mumuwase.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/46567020634.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/98351900685.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dugubux.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5744a4e4d39d88e426f336c734194e32/zumuk.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/89164688115.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/fajikara.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_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 11132 bytes
SHA-256: 20190fa8775bcb2bcd389f85e016c6a398a65ffc3f19cc51b84ffa84adf952dd
font_01_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 17732 bytes
SHA-256: ce813ad0aebdce07ac6dfdee2364a9e45664adec6b3c749b3e4f8053a9477b01
font_02_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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