Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca00b9226f43cf26…

MALICIOUS

PDF

77.7 KB Created: 2021-08-27 19:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 216477a21e981435ae5a51d3917669fc SHA-1: 8ead990480a926acb90319faf96eed6f223a8004 SHA-256: ca00b9226f43cf26a7677764f4d46e50dc811bde4149a9c02a6b3e2126285d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting other PDF files. These linked PDFs are likely designed to lure users into phishing scams or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9541d616a849ac3650ba07b226eaa30c/kimoregi.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083344f7a01c---tabitalopawowisakow.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/20676428426.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/surubetunawimigovegikor.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/zosomozipavanijuto.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d6c06c1ffcb81702e5bff4187e2188fe/dosagogejotarododezeku.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/73502397787.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/5ua6edjqauh4p79a1mrqdcatsu/zorigero.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/94392b71789b09b2ced3903c8b499cd1/xubaxap.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070736829f56---59478450763.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/tesovoretegadenapuz.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/barilovewibolomut.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/87480079340.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/wimukotalowujorova.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/22752787242.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb55b403e---66220591507.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/82757079617.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/57639139362.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c75485ae106---kolakusanisadinamisi.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/12557327048.pdfIn PDF document text
    • https://proxus.nl/file/2655324121.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/39921757937.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/24056932044.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lovoje.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e47fc428531907a218ea3a215b817826/10243251628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=muskegon+county+inmatePDF 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_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 17348 bytes
SHA-256: 5a802bab27ed4a972a04af02e9575846acc84dc763630bd15f3a17a33866efd2
font_01_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 10728 bytes
SHA-256: ec8d4f0432d14807652bacc04f7986cb2cd468f3a05c7f557b705b3f8a09986b
font_02_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1