Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae9907473dbf4a4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 18:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 871242830fd2dcae86ac524649762377 SHA-1: fc8f5b7fe1db0204c0b5cb69c6786035810605ad SHA-256: dae9907473dbf4a48bcee526f71af0ee83701dd758c04b17fc70b66a4e2e957e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the nature of the hosting used strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bucatariizidite.ro/printuri-fi/files/wavop.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1edb6bbb---76669411432.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/katok.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/32509604229.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b48b3ee16---42033593458.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/sobafutem.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/wojapimumetori.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/powewib.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/34309576886.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vofex.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20728648442.pdfIn PDF document text
    • https://tepihtrava.rs/files/palapa.pdfIn PDF document text
    • http://paliukenas.lt/i/File/xujiselanowobamelagi.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/12622853654.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c91fe98b3f---kugofepix.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/risuxaku.pdfIn PDF document text
    • https://superchills.com/userfiles/file/beselosimitimip.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/xobusidajagadofowiw.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/70210910010.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/kazufo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/56eb49eeb7660ac7f175af9cb503bf4d/gaxigefisekewilibavodoz.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/tukidudemije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rotator+cuff+anatomyPDF 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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 17976 bytes
SHA-256: bc95e262cf0f478bfa88f4af95b7e4d5143e41c576cc27e6f6b82d0ca1134a89
font_01_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 10316 bytes
SHA-256: 9e455c923216116d93b70ff84007861312f93076e76613141243f3879a7ce370
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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