Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb99a8a08d6d12e…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 21:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62434dfbb49feb84c9ae2a2d7da50393 SHA-1: 98bb7368dc051dbe15c78711d8403f335d5ce708 SHA-256: feb99a8a08d6d12e4492f5508ad85e0df61c84d3ced1e6de965f6f0d170a3c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=free+vpn+tomato PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/98293666782.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1048f28bd---zegagubel.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/48005262985.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/89111909560.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/78679114387.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/neduwejepupitalevalaresek.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/91278106070.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7176ec8c---sapazebabotamofumosak.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/morumixotu.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/37592746248.pdfIn PDF document text
    • https://mashura.co/userfiles/files/xakuxif.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/ronutojekufopediz.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614256b87386b---kivixugugewunupijasuj.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xudajejamoxifinixijuna.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/notoxabeniderokijikewas.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zeraxorufefunixude.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0aab61ab---40141213056.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/36897178816.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/56246251563.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/94901396545.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/febosuvebasakanevadug.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136170bd6a13---83701872289.pdfIn PDF document text
    • 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_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 16668 bytes
SHA-256: 2bdcaf3e03fcbce2be8d972c5bf005d39de589bf84dd99462686218c5417a925
font_01_sfnt_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 10152 bytes
SHA-256: 0f3622f1bac249c962f33d71e9b313bb85b8675717bc06a6016bfcfddcd9a80c