Malicious PDF — malware analysis report

Static analysis result for SHA-256 8982b7d0d9aa383b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 20:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a93ccdc3c0c066d1930e9735aa857d21 SHA-1: a8c4b6d8078eb48654a4fe2fc1d8de16df4e0929 SHA-256: 8982b7d0d9aa383b1fe526bd2b62fe743547e9bfcf6fec6737dd101b0a896925
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised WordPress upload locations and disposable hosting sites, likely to download further malicious content. The presence of invoice-related language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=in+a+different+world+with+a+smartphone PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a913eb7ea26---zajevarofejofojoxurifekix.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/863792eea10813e94c6e6056283fe5fb/zivelitikanijivasof.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/76113077411.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084f133d5c09---89028302478.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/56375763270.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210724_111844DC342429B7.pdfIn PDF document text
    • http://digifast.cz/userfiles/1992093119.pdfIn PDF document text
    • http://goref.ru/files/file/33639334431.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b438e6ac---27308522005.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/67570985006.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/83943104538.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210805013055.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/i08brp8r3e7hfvv89utblbg8ik/desuwuzikiwemudil.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/6a19ce366503ef523868c4f08a46f6f4/bozuzupavebugivike.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba026771637---puwetutijaj.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/46748475604.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff1afeea48---senevodesiluvezopulanitu.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/balupunerokavegaxolu.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/tisomelidufijozima.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/37547917583.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/92616638599.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_off0000d2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 18332 bytes
SHA-256: 2f08a6cdef78ad1908507a35ece9e707ef828d45a835c1c1b11c89fbeafea5bb
font_02_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 10800 bytes
SHA-256: 6a20f1b9531b325e1edfafd2486138b02482cfdc2eb8e3f9ee1a6b77d17396c0

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