Malicious PDF — malware analysis report

Static analysis result for SHA-256 807a3582628c21c8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 19:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5689a7fd2eee11a117448e7b0c6d38f6 SHA-1: ab3b827222f7322005b49b744420fb226eb7cfe1 SHA-256: 807a3582628c21c85c59196afcedfd10498e8e8f288a32f7549df446aff82f61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=top+ten+livable+cities PDF link annotation
    • http://mikomisushiwc.com/uploads/files/nefikavikaxomutalagob.pdfIn PDF document text
    • https://costarica4d.com/contents/files/13831563368.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/10537774809.pdfIn PDF document text
    • https://shevian.com/images/file/pipizikekaxuduves.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/68806956919.pdfIn PDF document text
    • http://boki.hu/editor_up/87296186744.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/93852456265.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4dd845f35f1088527648752969000b1/jajexetafak.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/6411647495.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/54185157984.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/sesulimufagunorake.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2de2a140---pobobuzuwebabuto.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/gulotusakatosixitox.pdfIn PDF document text
    • http://szjg.hu/images/file/vaxalujunaxe.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/wirafobete.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/zuvegov.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/gusowutokad.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/kekivinevizozo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1b8b95df---zuzixadisegulilugevo.pdfIn PDF document text
    • https://stotex.rs/files/lufimidemobotogoj.pdfIn PDF document text
    • http://mextro.de/upload/files/17904800131.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d164f91d5b---kurowadopuxokojedi.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210912044517.pdfIn PDF document text
    • https://schmitz.cz/res/file/dirijeputofonowutitokiz.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/bimafajozixafilejoze.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_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 17692 bytes
SHA-256: 35424a0d8045d0833bf8963a8380d20facded1753c572fb4e8318d182be4ddde
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 10436 bytes
SHA-256: 069b688590939a85c24eadeebda9d83ec65d4205b59bdedaa04e74797d59abb7
font_02_sfnt_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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