Malicious PDF — malware analysis report

Static analysis result for SHA-256 c016a86828470565…

MALICIOUS

PDF

143.4 KB Created: 2021-06-27 18:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26ef06cb7f91eb5ec0d8b3789f75f55d SHA-1: e33be785f2d0899fe1965a43fa4dcd01553d5a0d SHA-256: c016a8682847056590e792e7dca6ae9442fc3b2754ac057f85c98034a81a89bb
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://camgloberealtor.com/userfiles/file/nujizu.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab413bcc68---40168266975.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c3c85ff0---dumoxewe.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16089f91aedb20---17695207073.pdf
    • http://usmleworkout.com/files/file/xetufe.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0aa52529---lakap.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n9sp3h11tbr9vhesosslhdaas5/telimudewijisukumujukepe.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a90fbd3159e---megatozibuwavafusov.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/875e7a08860ff2ef72be8dcc4be32b8f/52602189973.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/65i4dhg047jgt3nn5ml7r91b2f/8583802946.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/pusexixezofilukegivojolar.pdf
    • http://solemarservizi.it/userfiles/files/nasirofagipop.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607605ab68e7b---97563654798.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ceff29ac---falijute.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5eb9d353e---65504200567.pdf
    • https://unosms.us/userfiles/file/77123570862.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ilmetkpclemo02i9soq8k34rs2/24243157543.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a733a3bf42d---75576252633.pdf
    • http://metapolar.hu/tmp/2858419569.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16084b810196a6---vekusilerifatiden.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734d492dc3b---rekuxejos.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6bfb01fcd60eb90bab23df4a80d08fd1/22751660027.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=snoqualmie+valley+trail
    • 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_off0001d469.bin
5d8a920f5491270270d4d1ea03a0c18461efed2d7b112742e85ed965ae662a03
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D469 16616 bytes
font_01_sfnt_off0001ffd6.bin
1faa1581b6c0238d9c9584e3dfd3f2f2afa6c66f9f6843a460ad9a2e16b9958a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFD6 10604 bytes
font_02_sfnt_off00021820.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x21820 16792 bytes