Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e6f626db0d68cf…

MALICIOUS

PDF

83.6 KB Created: 2021-09-24 07:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 299f74fb4f1bc9bc23970e831965e95d SHA-1: ef1d56f7a9aaca2d89c99b894d5dcde36838b1ab SHA-256: b6e6f626db0d68cf8843c83cefbe161a84ceb900c010cfae1103ea99ae8c2b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://librojuridico.com/aym_images/files/vawomezabebifag.pdf In PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/43250064464.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/xowizenelixonimibebexul.pdfIn PDF document text
    • http://cecev.com/stockages/files/tajitivixibosavi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16138706a04fed---57976962853.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/8081447977.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/rafamixikoj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f69cae967e---76220138777.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/kexipotiguxuxozazibag.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460c7848286---2032961049.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f5831dce---27462734152.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/judemadazofozowisavuguzak.pdfIn PDF document text
    • http://gespk.com/userfiles/file/44595084891.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/67668116233.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zebubimakimedigovixaga.pdfIn PDF document text
    • http://lactopad.com/uploads/files/60418257526.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/16437777939.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483049605df---zinix.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/2965361761378d136923b.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bipomotutigifarunimuxozi.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/72063793223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=torque+pro+themesPDF 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_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 10320 bytes
SHA-256: c50f9f76f19956c1672c2eba7b9c1d4913a6f6183f0a894270545fc060aceb85
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 18404 bytes
SHA-256: 765ce6833368c1c34bdb0a1075d05a0f90d5694c5f2ae518b93c96540817a819
font_02_sfnt_off0001292d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1