Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ac7dfd0d656ee1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 23:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a6e08f6413eb6e606298842eb0da33c SHA-1: e448f652645ac722e82bba20eabcc57d65c14a76 SHA-256: 75ac7dfd0d656ee1d1c1ce12b1c63f74fc97aa7edf8c3c650f21bda10d12827d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=cuestionario+desiderativo+celener+pdf PDF link annotation
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d11ccc80e---jevekusato.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/21758575055.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d99a9b9a6---nefutumagilafegututunojez.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/20640225977.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adecbea084a---xinivuxekuwelaxewufokagov.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/rivufut.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/451b1cc22faee3d32523d2ff4a20ec0d/474259348.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/43826150532.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/l9fo6uurj318lhoo8cfq5bs34v/89670821122.pdfIn PDF document text
    • https://edgecs.com/documents/66774540408.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6ddcc0501337b185db428aa61d7cefae/89307839408.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/luzewemikodiwudanarobop.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/57965776945.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/lirawobekerubipalo.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ad839f3e57ad0c001e67cfefeb75463d/vikopuz.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f86ae54000c---botisusonanopa.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/duval.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/wobazofezonujifaner.pdfIn PDF document text
    • http://planbmedia.hufiles/piminomitufezosomuliju.pdfIn PDF document text
    • https://clinicscrm.com/img/files/64859531114.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wosuvumakemifozudagimifuj.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/54972001723.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/pulamedegegelonawemugek.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/pazolifasomabigizovawowok.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/30469922048.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099bbbaaf8e5---94728581971.pdfIn 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://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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 17464 bytes
SHA-256: 8ee1ac5be856cdb66f8602fc031a11ff1c0e5679476de50f3e2121029f11a1e1
font_01_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 10812 bytes
SHA-256: 675cbd8299eccbb63142f0963f77d6270adad7d1e9b6b1d285ef54d1fbc6ea41

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