Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf73072b3a8615c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 05:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 256392a93548112dd347dc51dd77a9fb SHA-1: d3fdeca087c6d9841c31b1f5b1e411d0490e8b2c SHA-256: aaf73072b3a8615c260a519a44b560b60f3fdf8f0067ed276e486d855f019845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing or malware distribution sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=seeking+the+flying+sword+path+pdf+espa%C3%B1ol PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607f265c66a87---53089542453.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1020344956.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/39047209677.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4ca450d31847f798f8c8dba68d865dce/18932277709.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gupurejolakufedevobabo.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/69431909681.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u2p9jdn5ujdgrfnvh4tff6uag5/mevugibanun.pdfIn PDF document text
    • https://oversaslogistica.it/file/45792195234.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/101lumd3tdis0has00fjfirtr7/36456586018.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee0b2e4eb---17534730577.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/lelar.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e04e86b---71818661558.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/tivilukeriwudimowawanago.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7eaabf6f---23242949232.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25792e0939---87985309194.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/82711808684.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/jikodag.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/38343167271.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2c425dc54fdf9c292b0ebb46663e2bba/vevefifedasezogetezokusif.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/efaad934dof26mninjmb3f9bjb/18825263136.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ace29692c7ca4bf1ada5f03437e28e6d/46781248713.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083598218ad7---mekimigow.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/foxifilazezon.pdfIn PDF document text
    • http://fittbikese.hu/files/file/1507409877.pdfIn 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_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 17808 bytes
SHA-256: ebb4a95427bc92c79f74d09a43356c7e1a1d2e760e8030d0042441a1ce7f4fd5
font_02_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 11348 bytes
SHA-256: 6c01f7d2dc67e82bae8689bab129aa9a01837b3bfdcba26f98bf87ba493f8d4f