Malicious PDF — malware analysis report

Static analysis result for SHA-256 8affa259eb5faf5b…

MALICIOUS

PDF

90.1 KB Created: 2021-07-01 00:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13c15323cf2291be8c436a9cb0420a29 SHA-1: 0682c65f1a746a8880a2f21bc0ff23aa42649e09 SHA-256: 8affa259eb5faf5b8a2a943bb2e1cfdde1ed03a09c0f99b09551eb7ed61694ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=ant+and+elephant+riddles+with+answers
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf92ac78b1---kuvazudevipiju.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160953128402b9---13711575663.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdcdcaec40---93212588260.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ef32eb20---7830010398.pdf
    • http://cascinamana.it/userfiles/file/gesenibedasuwasi.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/af6c1d2c9418817cf9ab4032e27ec79b/91108013490.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37f12d381b---98929807833.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/677cb2323a4d3ffbe0149a93199ae4c7/71006953490.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dba1421a6---69004136361.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ab5bbea5---garezimagomofaji.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ade73e8af73---59402633895.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4ba6d949ea9a78a6aa5f0bfa9c14f229/donuzun.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9bd9cf138469ad4de4056e450eeaed4a/werugekixadijixudalido.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d83288c1---kugegetelasuxosukome.pdf
    • http://project-lovcen.me/userfiles/file/fiponixobilavarafomog.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c497d4c5ece---mezodetufalekose.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9d6ba00a0b6c2a2800a4a1cb00388dc9/39742688451.pdf
    • http://angelcabrera.com/FCKfiles/file/zajekewajuget.pdf
    • http://archimax.ch/dynamic-images/cms/file/23151801833.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160764dc4cea4d---tegikibobajubow.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3dda3956c---robirigaruz.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990f02d6bfa---91664234943.pdf
    • https://guineaservicesproviders.com/gsp/files/33750305042.pdf
    • 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_off0000fe32.bin
5da613d51b03fe9f63c512137529cdb91c183268f2e9cdabfef8a5a65dd5faf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 17264 bytes
font_01_sfnt_off00012b55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 16792 bytes
font_02_sfnt_off0001436c.bin
714085416a841b6645cfc2f36466a5b9945ebbf905a08a47f4d2c83029ddfac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1436C 10436 bytes

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