Malicious PDF — malware analysis report

Static analysis result for SHA-256 778d6ee205f3fe90…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 13:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89da61e4ad02d33ee619cd700d8242e2 SHA-1: fae4c282606d1865a428a423ee6407a9e348cad1 SHA-256: 778d6ee205f3fe90e3d57cb3fd0a55b85753090187cf73d51cb6d4e104883df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are typical of phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://honyi.tw/ckfinder/userfiles/file/sovezuzafonu.pdf In PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b16f91743e8a1e990fa710c52c5ac164/1136737998.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jusaj.pdfIn PDF document text
    • https://heyratacademy.ir/file/vuwisuralurefugudopom.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160768d2b802c0---mirufapifotew.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/begetuzojipidajuted.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/84282647168.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/44720599735.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b9e64fb2f6208c20b2987ba126989dfc/jakesugak.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/80683849118.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608926adf2b9d---webefukuzupenonobured.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/jowowolev.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/gp4c50an9ij0c1039ddrintftq/3719536776.pdfIn PDF document text
    • http://pjteam.hu/uploads/89750357210.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161325a1bb14bc---bikumoxib.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/1q03v7pgcrlm8l32rffm31qv2m/farizike.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/nosajizebuvanupelas.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/92680007b0bc505973b98bed64bb9c41/64351584835.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/33308437830.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb477af22ba---tiniderid.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc18ec1cbb4---70617717016.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa125f3b339---85885379430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wolfgang+nolting+theoretical+physics+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_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 11004 bytes
SHA-256: 46022d48985993ee6c56891ba9d854acf16bcaadfe2d1d806a16f6f624bbdc72
font_02_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 17688 bytes
SHA-256: 596db6d10bfd277e7f5349c318b5c8c86f255ce95793f8aa038886a24daf7e4a

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