Malicious PDF — malware analysis report

Static analysis result for SHA-256 402c545f3a2488dc…

MALICIOUS

PDF

82.4 KB Created: 2021-07-04 01:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 535560ca8bb06e94d877ce5e5973f294 SHA-1: aa5df84c2bad7431eb835a107ac6d35c703c0017 SHA-256: 402c545f3a2488dc174cbabc1b7fffe14f904615470794816587477609e6b78b
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised or disposable hosting domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/64a543ee97ce7a6d58170d4cce0e597a/doraxubazevejilugaxuboro.pdf
    • https://cargobull.cz/res/file/zaxaxexijemutenuv.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/255c4fe0bd56a83190277096e4154bd1/84132465663.pdf
    • http://bukhatirhomes.com/userfiles/file/80373550264.pdf
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/jodiritod.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee26de21e---mepigiwamo.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2535e0344b431c1239a70cc520f18b66/rofalaxigud.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076271651470---digetipup.pdf
    • https://glycocalyx.nl/userfiles/image/file/79184308496.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f66c5ba38---35243102475.pdf
    • http://gramercy-grand.ru/files/file/96492287032.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rq0cpu58d3knubvmqbr8nf8foa/92939465901.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9173a11f91---bofofanopawarikot.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g9af7bcqkvh0luseap7tgk64m7/kegajademuwugiwepox.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/db94c242ec6cebbe27b702c26a102da7/lofas.pdf
    • https://coil.hk/upload/files/4065632954.pdf
    • http://pinturasoltra.com/images/slider/files/guzimopemafupafedo.pdf
    • http://apsara.ru/userfiles/file/31941412578.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160befcb9212a4---35387678559.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b859cb4347f---773182235.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c9696044---tijirebidevune.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9401cf3ae5---zipifek.pdf
    • http://paulsaperstein.com/userfiles/files/pukifixebisetikiwelomax.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/41881835215.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608595b8cc1d9---59102337134.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+risky+business
    • 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_off0000e066.bin
2cbea0f01971f547f23392b5369ad8d5ff1e64bb5bc55e7586abdd06efb219ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 17436 bytes
font_01_sfnt_off00010de5.bin
41b546c74b497391163ff037ba26776b53ee796d8b9cac6db89c28c21e20f847
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 10188 bytes
font_02_sfnt_off000124af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 16792 bytes