Malicious PDF — malware analysis report

Static analysis result for SHA-256 446926b4668598e8…

MALICIOUS

PDF

73.9 KB Created: 2021-10-11 11:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 96a5e1229f78973d5f0fcbf7b4ddaae0 SHA-1: 15f87d538cc8726affaff378df882aa02b042277 SHA-256: 446926b4668598e8868735d5856b4b388830ecbf099d15209c8cf71c6fb84813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rivieresoceanie.com/ckfinder/userfiles/files/37403492486.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16151e2f57a915---kokozozider.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/xoxufusunupugipizu.pdfIn PDF document text
    • http://jadeite.ru/images/file/gobuzuvupukor.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/sofivev.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/75328287302.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/58159046809.pdfIn PDF document text
    • http://www.grifin.sk/files/84235224853.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/dogomitokedirija.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/foneterisa.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/kujumagotaboja.pdfIn PDF document text
    • http://biomehl.com/images/content/files/64700632184.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0588e857d---39045218900.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9nf49gfsugajfmcp5qk28d86ie/notedewosedibesizoki.pdfIn PDF document text
    • https://equalland.com/uploads/File/zimovabozuviwes.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/48043463117.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161484fb13bd71---ponusirovubomi.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/nitosadivara.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/28739898013.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/933633924120fcb7a246c2a34c656a3c/12587614295.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/bagazalatozozuwojujileki.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/41709126453.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/gelufadevever.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/30244221137.pdfIn PDF document text
    • https://castel.ro/userfiles/file/27025709734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=dragon+ball+heroes+rom+3dsPDF 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_off0000ba91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA91 10820 bytes
SHA-256: 298a5ee1ed65ec6e278c9467caf6f91a4e55b2bff4df09b8437649dbca724a96
font_01_sfnt_off0000d317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD317 18144 bytes
SHA-256: 23df1e4c1916f54fe92b446e84dce4bb9c60aea48c9ba5bbab7817d101ea1c5f
font_02_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1