Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bc6ff90b672bae…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 09:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f29586adf1086a1dca999e335b34fc6 SHA-1: 391c33d882554a6d37cf56197a90c59805d85a94 SHA-256: 84bc6ff90b672baead0fe60504fe2b838bc4e453186942bc68f0055f0aa4acb1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oncetrabzon.com/resimler/files/94591587585.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b79326ae2cf---woxotujejebugezusezena.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/37d7660fa41f811726f943c452c47096/vozovipibuwi.pdfIn PDF document text
    • http://vgkbuilders.com/assets/files/xudedosid.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/68668828702.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/66688460125.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/fubajulig.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/lemidodurofifusojaso.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m2om236ckp2j60op4boo28i391/28619600688.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612da88b934a3---4610648425.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jtrphvcnvsehqgjhf3eb8p4b16/romudegedunarufijewuzagi.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/liripinorojiribelopomekix.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/bozafaxupusejixixepojebek.pdfIn PDF document text
    • http://kids-ex.com/25386499689.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/cqo9e3i4be5n90aefrvffkr4mv/tomizam.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/vutukamanizadapudedodop.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/37po2n7lr7ub503a31ni01d388/77407848845.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1359709ee579141d26bb775602e94e95/gifurosugabugixaxifufina.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/vawifosijafopenipa.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/53741490594.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/delezekemowuboduludevu.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/bavekivebiwunekubidajab.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/5485293307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=third+twin+pdfPDF 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_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 17952 bytes
SHA-256: 99c3fb640359b26cde2867942252398213f493eb9e9fc727c04811418e46ac52
font_01_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 10016 bytes
SHA-256: 36ad67574a8eb071d15252796511e340518ac5a865b33d203980be6df3b4b373
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1