Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d4b5f9a02d8545…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 14:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb6a2547daca8ff76d296c19c492e946 SHA-1: 7d0bad6413c00eae8c760a6c062c5344f7297e44 SHA-256: 42d4b5f9a02d8545f198e46eea73080b52a438e1f1b84f36942714dae4e9e25e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution tactics, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://toptoptraining.ru/img/upload/file/podibamu.pdf In PDF document text
    • https://bharatbiodiesel.com/userfiles/file/62173698043.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080d167075e2---kanis.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/gapekin.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/91433049979.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/xevomebufufiwug.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/akcrd4pbjul4lfa87g2a28o103/39476934969.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/71744197982.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ade29eef---4993831215.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/niboxofovimudusi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/72429739410.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/13fc498e85fc010a4736528af9e928fb/timon.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/jojuzopiz.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210805085639.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a262eccb31d---35760870479.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/fonodawafifilifat.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/24605632077.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/fepug.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/60137204145.pdfIn PDF document text
    • https://dietacud.eu/upload/file/watesutigijidegesekapofo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7350c0d22f6955a921ee3cf99d49fff8/rafulexumenowixogusoku.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/85831771544.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/rujexom.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/61f01038646f55aa96cf6ce5dfc1d154/rewodujabenetarapek.pdfIn PDF document text
    • https://marosme.ro/hirek/file/6356152000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ds-160+pdf+bangladeshPDF 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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 10884 bytes
SHA-256: d59601f235102061e6d1aa4c6b6e29f2f1c5a9f260abb9fd4a1f9a244fe83943
font_01_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 18472 bytes
SHA-256: e0f4f1db35beb80d6eec3111b7a8cdb4a567d44b74145853804727acb838f9f7
font_02_sfnt_off00012dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1