Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f3fc7e1d532e56…

MALICIOUS

PDF

112.9 KB Created: 2021-07-17 14:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b2e3a065c1f872f1cb6c492e4289180a SHA-1: fa30f916fa88aadf368b178e2917f82ace95ef48 SHA-256: 24f3fc7e1d532e56f1412dac794d8ebf0d8eeca127037e2baa6cf729ea183f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/p2ediqj1a5l15i461dj2shn5n1/29737389091.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086da10a8861---somopon.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c0130227c03---46016280631.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/41f2fbbea21ffaf0bfb0123c764f2434/31184850607.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b0e473cf---luzulawagoruke.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/rorodaxotisuvezik.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609873de786cf---47507142113.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/sokozik.pdfIn PDF document text
    • http://citra.cl/userfiles/file/86631374508.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b37b40042---zogusufubabunabi.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/59866774372.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f81771cfdbbc14464d02e821acdcd688/43311614677.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2c33ffbe6838149fcded89914687ad09/sisaletizumeja.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0362d9ed---33056413053.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r0a5iq5ei3kmoi9u27uj8bfbj1/tulun.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/sofemilebejazexederurog.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2du638h2jat8m5r3jv9kq0lfbd/32142111416.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/gasigujuz.pdfIn PDF document text
    • http://aweibel.com/Photo/file/dadutodikukawuv.pdfIn PDF document text
    • https://ptogel2.com/contents//files/jupofogekagulimivogo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/bilolakelirogeke.pdfIn PDF document text
    • http://teifsepahan.com/files/file/marinerasuvotim.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/fgphpnrftlk66i2oq1cktu576v/96303457199.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/tafumolomozate.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd783e3c3d---kipaga.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/11984835029.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/borozekujanadigomakin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+crystal+first+gymPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001454c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5E 18812 bytes
SHA-256: edbd98514afadb40a3403c6810eca5ccd8af483e1b37ebc8e5f2fb9b01bca6ab
font_02_sfnt_off00018dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEC 3596 bytes
SHA-256: 3c676ccc9da5c303b66a413affb4f23c6cd0a5826a9905d4bcb331f74082b555
font_03_sfnt_off00019c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C6F 10888 bytes
SHA-256: 9d6cfdff678de74bb7a67fed514bad621387a1c9a2046de6cc4524bfee737119