Malicious PDF — malware analysis report

Static analysis result for SHA-256 6274d62dbaf11717…

MALICIOUS

PDF

217.0 KB Created: 2021-08-07 08:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fcc43eeaeac1657183d09e5748a7aa6c SHA-1: c40cf446357e444f5e47049ecee9035483857781 SHA-256: 6274d62dbaf1171729266dc092b951d5b024ab5e29fac7ea40fa84a3cc3a7abd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, with one heuristic specifically identifying a link farm pointing to compromised WordPress upload storage. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malicious content. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

Heuristics 5

  • 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.
  • 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://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/gcpitaen9b0dcfris2vp9kljf2/rusanasijolegosurap.pdf In PDF document text
    • http://jcon-aps.dk/userfiles/file/69615644149.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210514/file/61416293492.pdfIn PDF document text
    • http://novichiha.ru/pic/file/61531199859.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621315875.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160725d0e0cd24---33100653344.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/94406943123.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/42488104491.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/kiwitegigegolopav.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8247a9909a938b0eaf02206c1f5b5fa5/gajevobodiminovo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6199a86---bamovufagekorop.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b9492c377---velajezetevegutat.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd587d02c---97566765592.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/nulitedegarum.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/zobifaletilarezofo.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/vilogawesebeto.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/ebdac3d57914ec000f0bad32740da28f/8273159356.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b062e2f75d---pedilimulegipebugifop.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608d44964e708---lotinekupusov.pdfIn PDF document text
    • http://mqskin.com/luutru/files/zejopagunemeg.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/misivutoz.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/81586907967.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161078c77dc794---30523024592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=turkce+b%C3%BCy%C3%BC+kitaplar+indir+epubPDF 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_off0002f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F353 19560 bytes
SHA-256: 1e256c1ac57eb9f8661b88793cfba2373bb155510061a0d352f3337f65df514a
font_01_sfnt_off000322ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x322EA 10820 bytes
SHA-256: 173e0ad41f28a92f92339137702ec9bdb81511c16e1e50aab4adf6805bfc638e
font_02_sfnt_off00033b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1