Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c1791c072744b8…

MALICIOUS

PDF

83.3 KB Created: 2021-07-31 14:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 586c7c0a819d39cb3e3033056be9b35c SHA-1: dbcf813c1bd9f6783f81e49b5956826da5b7b338 SHA-256: 67c1791c072744b8a8828bb61edce91fdb620d04c032af14ea06c1f3311cc4a8
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable domains. The presence of numerous unknown URLs suggests a phishing or redirection scheme designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://greece-ex.com/64472985734.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794b13df257---57493719133.pdfIn PDF document text
    • http://millecolori.it/images/file/95604586054.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/komenidaxuwiga.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gejch1u16rsgu1eelsuo2sesm7/tekusutugitinikizivifeped.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/63345217849.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd0477bd0---texupibukafivabez.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf8f8b2e5---ledagujizatowujagidoj.pdfIn PDF document text
    • https://bem-sa.com/img/file/60057896148.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bf549071---81470348096.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3584acaaf4a689af3fd01dd424a277c1/pibumubanotulowosat.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/corbhael5bdjf6g3keiocpnv9e/nuzapofuzapiwo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9244cfda---duxevawatowado.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/xopezonema.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/wefipokuxutumevuvibe.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/rokuvojetatepelo.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/kuzekasojurigabarinemavo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/dd8fb254bcf657c1b0edfc7ca04f153a/85612447898.pdfIn PDF document text
    • https://nada70.org/userfiles/file/58651770489.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d472d7d48---kokarawolitasiwanitusibit.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/53404573332.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/12631798446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+turn+on+atwood+rv+water+heaterPDF 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_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 10284 bytes
SHA-256: 0cc62da0b5ef845dc6e7bb27d489ef742ed7c77184d0224e7d72d307a96cf66f
font_01_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 16796 bytes
SHA-256: dcd58354eab2c418bdb902e7098397bf3f8911a79310c6a573d8c27fc47c3437
font_02_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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