Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73c16b3d197b315…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 03:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 567d0bf4a0c421e792e465dc6ed578aa SHA-1: dc6855a0fe1087d3074a557f878ca5d2e872da96 SHA-256: f73c16b3d197b315746e3b7292ae707f3eeec723383f30800c27f547dbd1156b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=how+to+get+minecraft+after+deleting+it
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/47aae79917d271228dbbb83088b4d9a7/kulej.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/dg9mi8pn0kapl69665tavhj9p2/rejixajubatoga.pdf
    • http://envigest.cz/upload/file/11645163869.pdf
    • http://studiomanzella.com/userfiles/files/devomafejabojin.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/08ea1c95ab51585bca58b87860c3372f/97367888875.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33019a4546---fowifopitobanede.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/eo4sstitpjdsgnavs5hkviq4f2/2271204942.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cc72646dac5---mofedapiwejibusuz.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7c82e30e8ec7817ecb8c3df41d7806b4/51649254751.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872f4644e8f---39645744025.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2a995f34c1007a00ee2b5c7596439ac/nunajikorevegikifokoxuk.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd10f769cd---zugisatorab.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a84758cb---tojopiguwusubitojelud.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c188f9f77c54d78124dbc7b47f8800e9/fodavuxapobomovovew.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/jexuduxutejexuj.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070945078f55---30645446016.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc8261fdc---10288095036.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6cb76ef5a82762b4b6250e2b6ab80d0e/menamerufebef.pdf
    • http://adams-gold.ru/archive/image/file/51419876015.pdf
    • https://efnnma.org/files/file/tibifisiwaj.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/84fdc7395b418863c288b17bfab7a394/32213605664.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608447acad286---84025923954.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_off0000ebfd.bin
db5df8a8f276ae5f3afd8cc3e91424bfa28cfd396ec9c313c35ff3a364901e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 18164 bytes
font_01_sfnt_off000119e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 16792 bytes
font_02_sfnt_off000131f8.bin
eb76b6f3a45acaa8434b24ebde7c8ab1ee148f213c412724773b1792ed011aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 10728 bytes

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