Malicious PDF — malware analysis report

Static analysis result for SHA-256 03217bda5581f04a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 07:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10eec86c333df15e4d539c7cbfe60811 SHA-1: d7bc21d780fcf7c121dedd9a9440751233ef4be2 SHA-256: 03217bda5581f04a0957430a6bc471ff75a9b475699ad41989a7a700bb84e30e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/60sfteuu63oheshbh56dih76k6/60733782662.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f11139ca1---54553047011.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/7199878763.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/natenegetenulunovifi.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/86129712203.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/80589124691.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/39978206671.pdfIn PDF document text
    • http://findusafranchise.com/files/files/80971583756.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133614c2cccc---91936075898.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/74497057607.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/92702913944.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/10464384029.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/borabinaliwiba.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/49730142789.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/58687820810.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a806089a30cfd648e309f89710dc02f8/zebowowexamizemaganojoxal.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/zumikemejulik.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/mipariranisarikigugomater.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/dunokebuvuzuxaweju.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/46512064375.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135acf3271bd---jibusuvugewatofoxe.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161385e37799a7---nakuvogikunowonuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=acrobat+remove+watermarkPDF 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_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 10348 bytes
SHA-256: 98e4c3d87bd1c87bd635c82fd357d2390be71f8fc92ff37a08995b4be2881ba0
font_02_sfnt_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 16864 bytes
SHA-256: 7ff33cb736b5b3fcbcf7bc7f4eecf73ed5fc776c7018ee86a5f2c29ff59b06eb

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