Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4f49bfb6a42098…

MALICIOUS

PDF

84.7 KB Created: 2021-07-19 01:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8be97bd204f7a2c4fd0eaf1dbd06fb8 SHA-1: 4c61c5777be15238d62b164963e9efc8fb67deae SHA-256: 3d4f49bfb6a42098963a8903b8af3d9638aba94dc63b62d5f8e423c7ecf0d352
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710353bea5a---xogowe.pdf
    • https://papiratisk.cz/soubory/22700401353.pdf
    • http://younewstoday.com/task/userimages/file/lipufafuta.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c63a88db1---95920154319.pdf
    • https://aspirans.com/files/file/xorubitorusotebib.pdf
    • http://dhs1959reunion.com/clients/871764/File/90914113837.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05cd0001cf---jikanoguvuxobuvi.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ce64b382e9837a1859e685d98654c2f4/bevezotukulumivixiwilik.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc980cb24d---pajoloro.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/517fd0d2a18b945d73c0775dc738f69e/86731883030.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763aaec4b42---47775761848.pdf
    • https://vigiweb.cl/dinamicos/files/file/kipawufumejo.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/golopulupupadovajiraxevo.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7f7a1283---77990109283.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2bdde0f2b498d966bea7f4cb75092d2f/firudovijo.pdf
    • http://moje-stranky.eu/userfiles/file/nasuva.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/80de0e2160a0ecb785afa25ec32491c1/siradaru.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce1a30bc4---71270016019.pdf
    • https://kasihpaham.com/contents//files/fedivokatuzatobosek.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/piwimov.pdf
    • https://anfauglir.com/images/file/nezilimafiwugujukofug.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bf254e545e9e9211c2a8780742327658/64948468911.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49e9cbe152---nogiwexakulamet.pdf
    • http://wib24-admin.de/uploads/file/varuwarijupixabametuwu.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0f811d86780aada2caded6cfa8c0bbba/fubepezefupu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=neat+hourglass+body+shape+clothes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e815.bin
fc0d476cb6321c59498834185cef906b6af9ce535061c8cd5bb49e6834b1459b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 10928 bytes
font_01_sfnt_off00010131.bin
04ba51cc6d316a2e3072356f1588353f9fa988f21c658527761656b75841dc4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 17012 bytes
font_02_sfnt_off00012d74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D74 16792 bytes