Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b67eb3b54cea944…

MALICIOUS

PDF

155.1 KB Created: 2021-09-04 10:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f94c78fc535078880c9317ca48dc268 SHA-1: 394ff78b7e7d9a2f8b2b5ee3e9b65da30a30be1a SHA-256: 4b67eb3b54cea944b3cfd64a3660d667f2c88aad486e5dad1333b0aeaea67315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chcial.ru/uplcv?utm_term=eugenesia+pdf+unam PDF link annotation
    • https://alarouba.com/ckfinder/userfiles/files/tedapubasezokugolineve.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/bibutukipipitin.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/22041364919.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/xelubotejatewixozujewe.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a214890fee0---73421215505.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/58048404658.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/resojopas.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/vifopufases.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b72c63cdcd1---46223522516.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160879e7bb3b53---repevedusejolunev.pdfIn PDF document text
    • http://pvvc.cz/files/wafono.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bff5b683---12679754850.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q3io5l645qnpvfjd3jthj58fpc/23177071384.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa9d62c88---22276750099.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202108310519555311.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/namixeparilipegiserajikiz.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/9667112978.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/475ffacc93007360d05106ca171c38e1/kipimefazudavonukaxupenu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf58cec14---jideravekas.pdfIn PDF document text
    • https://amblamy.ee/upload/file/budizotad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c4f77bdc---xexixogakatutanu.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/45535477543.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_off0001f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F528 22816 bytes
SHA-256: 9d8c8ccf8815c4acdb6baa8d1459147b3fb27ca6f82ab4a9e1936fcffbabe4f6
font_01_sfnt_off00022e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E32 10560 bytes
SHA-256: ded75dad374640480ef5db0ee80f55b8cca6889f4fe70b288bedaa2d17fea7c4
font_02_sfnt_off00024609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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