Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fe0d28c93a9b36…

MALICIOUS

PDF

83.0 KB Created: 2021-06-27 13:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc83a8394cef571242f0e04044879c1b SHA-1: 46bf85770890b0e063d8919c52fbde0492d82a0d SHA-256: 92fe0d28c93a9b3666913e999012925e629fc70fec326425defc07bef5122a49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to direct users to malicious content. No scripts were extracted from this sample, but the presence of external links and the overall detection profile strongly suggest a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=pertussis+vaccine+duration+of+immunity
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/afma5ao17n0tquhnqj1jaa2hk0/tebena.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609273bb55842---bunupimigimudivijuf.pdf
    • http://ztkammer.at/uploads/file/muwomoniwexosofefumo.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bb4a68a4f947855640ad1551eebcb200/mobasorumal.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f2fc84fc1b73e9ceb9992e2cdf590477/95264272771.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c950a90a05b---mefupezube.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608609a04e8c2---kurajexinedagonegenorajok.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22ca86cb6---38330815396.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49eb78040---jutavuzurumidepikaribigoz.pdf
    • http://solamsys.com/userData/board/file/kobekozenigekivusaxip.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe7d71161---zexulebokevuniwog.pdf
    • http://fst-uinsu.net/userfiles/files/tetemid.pdf
    • https://rubenoferro.com/userfiles/file/99386728183.pdf
    • http://ed-web.cz/userfilesfile/50647853780.pdf
    • http://wittlich-luexem.de/userfiles/file/47400257813.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/xoxolejikelonenokiwemexe.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c67df605f85---dejosorivevoxekepe.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1f0219813---28886031272.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/011334779091db68a5ef542808ee514f/89115856159.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/aead320985de9cd181dcaf1023a397bf/pafexidefizekivido.pdf
    • http://soles2walk.cz/data/file/gixudofalidapitepata.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ut1j7dmd4ttns0nraui9sst0g6/48212698967.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/jja73qphb64re4k2scorl11572/sawamimowu.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waxazonuja.pdf
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/geniba.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/k1nfoei7kgug008o2o0chmm065/64806418231.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d2f766a474e68c90f174f630232fb4fb/68862443208.pdf
    • 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_off0000ddda.bin
913b23f2fc74b142dbd26dd75007d4d2a8cfc3f5dbc6fed4e882b3f110e74453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 17860 bytes
font_01_sfnt_off00010d6a.bin
c72db762c7643167439dbdfabb244d90027cfae0eb9e03754c5995a67a82284f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 10872 bytes
font_02_sfnt_off000126a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16792 bytes

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