Malicious PDF — malware analysis report

Static analysis result for SHA-256 84045127ce5c62f1…

MALICIOUS

PDF

240.2 KB Created: 2021-06-29 10:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7a4b728033850c8a0a1172670a27e74 SHA-1: de48f63ab82e0f469ed147dcb86fa0a6e5c54616 SHA-256: 84045127ce5c62f1fef3481b543e3e707f11defde4784b44345935e93b86725f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to compromised CMS upload storage, indicating an attempt to lure users to download malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e17c2590---kijisozevapivex.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f262ab62b3af50bbd451943bb5d3c1d2/kodibafemozepazinuvibu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/foduneja.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2fc1c502b55ba0c3ea0156e797154d91/dajibigipituroxufutono.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0l04emtcsf5ppbpikoq0dg4cg9/rafixifinirovareselebo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3084e7c8---87957659821.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/7dc3ba627a7af6cf37aaf626f846e57a/dimobekibejevupojofilate.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3f7ac86ba5d7ac980eb3f281c91755e8/wulegovasepunefot.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c736951e1---vetepewuvisilowen.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/fapubupesisuvulaforabep.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/60994286221.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/vozamalawape.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608974d1b4576---36427419189.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c98feaa6d225e638999efca1ca348ef8/59410943711.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/lufupeman.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6187b28be0a97e9ffd39373ba9ccc993/nabeda.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/kubiguxodibiba.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ddd2c32b0---wotefonufesijidojewam.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/bd6e1f12b29e0810d6492dc384942a73/bajiguli.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ddc81b0ea---1369088292.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bb38adb29---kovisujadukotomikaxavo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4d0a2884---88521697677.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/lonobuwaji.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4937c0ca0---kiwuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gulf+of+mexico+lobsterPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00035166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35166 10612 bytes
SHA-256: 5bc1effe5e6e75683b61735ae5c74c00d40d2019fe01d7936c197fd725859311
font_01_sfnt_off000369c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x369C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000381d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x381D7 18796 bytes
SHA-256: d22125913abfb5385131c59d718a48d3c972076bd5ba6209f2837a3c73d9ac42