Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81650c845854f57…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 02:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30b153b9e2a6886a7ffcb65b0386926f SHA-1: 9f33082f7aedc370df37ad93ce2e7150a1f6b395 SHA-256: c81650c845854f57b679f459206f835f811f7fb479680f663e2238b3d82ab798
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allmassage.net/upload/file/20210905052415.pdf In PDF document text
    • https://bdata.vn/upload/files/juxemiguwimozezumosipapaf.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/40121739692.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/12546334782.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/27092521790.pdfIn PDF document text
    • http://ternovykh.ru/content/file/gipuvepotodezulomasefiwuf.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/aced298548a43e4c8653213437b2fda1/56909745922.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904091256581642.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/wapagosikezurirunojemukix.pdfIn PDF document text
    • http://gespk.com/userfiles/file/mutoberusukemujuke.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161330442a0fd4---zibudejulamaz.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/84373911041.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/kovuv.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/83080961130.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a4e6c279684e47ced76e09fc8e3ffc91/17113971622.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/modirodumipevaleme.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210905/files/20210905214757.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kododofamowedevo.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/7933800964.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/45069493744.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/67741516111.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/sutorozuvawezejozanumeso.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/denamibudake.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/dojafovej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+change+homepage+on+androidPDF 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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 17572 bytes
SHA-256: a9f5834c8db42634ba26e21f9614487b6ed50f2c3853bae7980bfec0c97c981c
font_01_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 10824 bytes
SHA-256: b48cd97612a7793ac6bb39a5f60fa34e92a5560236c3aea535eb670eea947344

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