Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea2726f6ff9a6a4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 12:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0022e8520a19b1b6b207d3df4f9dfa4 SHA-1: 0674146bc45abe72a7906f050372b304632b1889 SHA-256: 4ea2726f6ff9a6a4ed3e9abf50eb3109174e5c3ec7aa00818e61d61568fd3888
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely to obscure malicious activity or distribute phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=adb+backup+command PDF link annotation
    • http://cardealer-space.com/js/upload/files/16223832214.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9ea539ee---69700799641.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///nufaremejogovenugi.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/6902309176.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/49425634018.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/5452545944.pdfIn PDF document text
    • http://gespk.com/userfiles/file/juditadibav.pdfIn PDF document text
    • http://waypl.pl/upload/File/jijivu.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/niweve.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/89617963743.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/melipefagasovazoxajal.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/wovekotutuvez.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/89603941986.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134af569d756---38055678773.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/45891557523.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/18535845483.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/pimuxodaludotogebexolovi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/buuo5ngsin7lbua5bd12a9a64v/nelalupasokipalotiruzivef.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/66591087144.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/jezifolowowajibomepaz.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4e09b79b01a1488227a618fc61fb73a4/37747804470.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_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 18252 bytes
SHA-256: e8457fcd0e1f822db1eb1e7578e6f936f77d90d6a7dc20c778d99ed7ae71c75c
font_01_sfnt_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 10352 bytes
SHA-256: 189a49adc3fec8b99745c785658090c5782524706352d3c00617f5d6aab0b847