Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cd727407cff557…

MALICIOUS

PDF

76.5 KB Created: 2021-06-15 12:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1913b09cbfeb682d853786303bdd4d66 SHA-1: f50060a266a8acc54e9dfe7a349c562a41d8ab9f SHA-256: 86cd727407cff557910f3b51fbc8da556de202eff47e17e9bb51ba8ce0c7802f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to download files from compromised WordPress sites and other disposable hosting, disguised as a PDF converter. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://laborke.ru/uplcv?utm_term=vce+to+pdf+free+converter+online PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0f8688c60b9958ed3b678132834ed736/ruzilixulovuj.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b7b441bbcec36998658341130c581484/fokiferesobi.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/wosofepupefowiku.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/vaximewaruvederinokutep.pdfIn PDF document text
    • https://davaocarrental.com/images/file/kejunujabidetekerexa.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/pikun.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/jimifaw.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f84a7926---zesekig.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f822e7c1bd---sobadatu.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/mapamojise.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b9ec94f8---roxotid.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/130a0b836a1096648a8aa5cadacca4ec/44217844722.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/lcpm1i6t1e75044pk7plffop3b/67033666964.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/boredavemorivejega.pdfIn PDF document text
    • https://maturana.cl/upload/file/jofokipiduvofifivi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4ecb9f468b275738034f0049ac575f5b/lesefajebigojogelezas.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a6e59e36---kajegorijorakevudabutev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 4784 bytes
SHA-256: af146f7ebe1bf2f48fcf89d7123a354826ef760d1bce29409bbd322a2ae45f55
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 11980 bytes
SHA-256: 2667b151e5c9c5e98823bc89134abe8490cebcf5baf4446ec195f0244adb52ef