Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f037e0439d4034a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 00:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 93751f1e75cbf555b845a9ef43f33c58 SHA-1: e85dc6e4bae5f088e8b9a89ee0e85cc5f1972709 SHA-256: 2f037e0439d4034a4d8b491fe061c0a7e78560ce41be844573063741178120f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=humulin+kwikpen+user+manual PDF link annotation
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/87426104456.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/61085943051.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210704021204.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/54713657200.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/21899981357.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/51861703063.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/98921003493.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rudajavorok.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/55ossusui05l0of1ploejjbg93/57889837961.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/mepafekugejigap.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607887d453dbd---29293705470.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210818_134549.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d364d4b94df---fagiwojem.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e50a4f05---853396046.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/99032219608.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bea27af7f---74473615695.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/87401603932.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/voxafulujadovadidewovum.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/26139100933.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/88535062725.pdfIn PDF document text
    • http://debden.org/userfiles/file/nagetek.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9b83dd37d2b6b9062ba0289a4e965927/xaxub.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/db59904a1bd4954d0168917a2300ccc4/91766725557.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128f0a06292f---zuzufanow.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_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 17464 bytes
SHA-256: ff5ff502a6de2fe735513fd31d890bfbcdd3d277d13d6a868e9fe8b28b3dfb96
font_01_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 10464 bytes
SHA-256: 52643d7bbada207cdb507933f73ec2c477958963dd211bb53cfed7c95fe2e8b2

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