Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bb665295d04b43…

MALICIOUS

PDF

111.3 KB Created: 2021-06-30 06:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 24a7edd9a8c0fa4d518fe12132581fdc SHA-1: 5dbf83feb2cb739a7a1b2e99b7ebfcd28cb9105b SHA-256: 36bb665295d04b434a09445e52550b94a56e543964ba726fbdb88a769f9bc690
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9729

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://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/vtggo5d0fit0pah7aqsdalo0v0/68825329180.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776fe2f3901---77672100991.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873b0b41430---45134546299.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6285022ed0d47c1e05e05bc0e7bd0f5c/simafofowo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/71793507793.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/mipizozoleg.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/58ed9d1af197c4e83bf8d8ba2db7d0cb/bofab.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9f004f0e---62437919275.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/jiwejarerarixevawenu.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/nujetinuvekir.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160851f6998258---zokekaravali.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/c486e9992e5e9d032441977ed0b95df6/somekejebif.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/g151k3iv5ehrvps1tcq8d2qq5d/diduduni.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160701d494d404---kuvuvawugizuwibe.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088161176733---12805967191.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e5f680fc29d1f5a9cebdc68a066f3521/82200932888.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0ea03843---vefufazebedajag.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/34bddd2c233ea3ac768cf030abf9a411/sonolebabatomivuzavoz.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/ranewetugamum.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/jorisizana.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/98216666219.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1553128---86097733110.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ed7b2c94---69940193472.pdfIn PDF document text
    • https://ivaco.it/file/fafeliwerizotunixivir.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/001l4r97uhtmvj03aecsgidcb1/21648416899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=integrated+direct+quotationPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 10528 bytes
SHA-256: 91123ab1d3c17de6deab2740859e11c0adc489bf9c733b64f7858fd64bea8c27
font_01_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 6140 bytes
SHA-256: 219c1e070fd2fb92a7c59e991d84cae3e098b300702b56d6c59e9af2db93c407
font_02_sfnt_off00014e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_03_sfnt_off0001642d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642D 19860 bytes
SHA-256: c0b3538aaea6dbcad723c183a32036d64657be49b67644a99e72ba83a8f3d78e
font_04_sfnt_off000196a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1