Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d8784d9959f6db…

MALICIOUS

PDF

86.5 KB Created: 2021-07-02 19:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88cccc92e9ed74220a31a37756733353 SHA-1: 86ba6aac1253aa4940038b96be4382029957e578 SHA-256: b8d8784d9959f6db92404332a60afa2e4c21f296f8736b8cc46b89017777b38a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://on-video.com/movies/movie_data/file/85163739898.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a697216bc---golujoxeg.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/u015bq2s4hh5734htr0b3hj7mg/42661326364.pdf
    • https://ludifrance.fr/userfiles/file/fipabasojogoradawute.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160770e6dc1ea0---bupulutolitakebepivu.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160829f29ec314---mubamamowivomiduzarek.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c992f66fe7c---solezugupupabepunavave.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/fojuzotazamejad.pdf
    • https://rhodium.vn/uploads/news_file/fapikefozulinem.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b541ddcc07---82942571844.pdf
    • http://willbramephotography.com/36912181678.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7d2f110uvnntm2487regv0mkg3/xakutar.pdf
    • http://bhk-aindling.com/userfiles/files/vuduzu.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/et5a7dcdsl7a8otv8o0o4b3fms/21107119100.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb4a6c749---95204851536.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e7e556fce1eadfd406357a8a5a94d12b/54580613072.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0fabf3f16---26721393118.pdf
    • http://alphasigmaoverseas.com/userfiles/file/55907647402.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb49065786---bafevovit.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/melibipusemovokuxaxijaxo.pdf
    • http://asja-doll.ru/userfiles/file/91805699163.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8dc557d5---rurudejozemedepar.pdf
    • http://sotel-perm.ru/site/file/lulifejunibipadonekaxawa.pdf
    • http://jinistudy.com/_UploadFile/Images/file/gomevigid.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bdf0e442ac210b40d660657461fd0eb9/davemukotenopepadisobil.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8612cd8e0e---55861098222.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=last+drawn+salary+for+gratuity
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f031.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 16792 bytes
font_01_sfnt_off00010848.bin
c2a77b3ab814b0d56b757b7e38fa15e916761866784d2c675f0cdb38998b6cce
pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 10652 bytes
font_02_sfnt_off0001209e.bin
1ae80e50fc36503f1547eb1a2f917da4ae73871091abfbaf85cc929e8dd9a7bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 16952 bytes