Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d951b07190b9198…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 20:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecf53e94ac2d5d0d6059e9f47ba1e2b4 SHA-1: ba59365528a3a212f6bad42d9e8daf718451bd5c SHA-256: 2d951b07190b91983d869117995656a6d51b050f23e4e59b3aebb4e3d8de5aa2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs are hosted on these compromised sites, which are likely used to serve malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3b36bd6d---nofejepexesefoxiku.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091ecc4eb4d9---jebobotirax.pdf
    • https://master-service.ro/images/file/gefuvolova.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3347c928d---mulutefexej.pdf
    • http://wenxuezj.com/images/File/16423349818.pdf
    • http://maduraigarlandshop.com/userfiles/file/63608249862.pdf
    • http://market-oborudovanie.ru/upload/file/56747718375.pdf
    • http://thebankcardservices.com/uploads/files/7326321206.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4e130b89---lajelaj.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/55534399601.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afce819fbac---roxatawojakumegonosom.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3b584ae89---73489013594.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca6b80989---7214225974.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9re1bv4j0ui7dgl0ih9nn7du2b/bemupuwazukafusilewa.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160af3f8a71389---pujovazaxojonujudezepi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93d92b2b---rixoxu.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/926829cc9a85497be9a56644a478b204/pipijexukarofozuvavepil.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759165dca7---83383575503.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac410c9e015---jukokifoj.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad55f39ef9a---3709871074.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2dc38948---91288488088.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-30/20210530094909732163.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609617a3a16fa---8698728193.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5087133ee5---xelevubasagijoxoxubomudet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nms+capital+freighter
    • 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_off0000f36c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 16792 bytes
font_01_sfnt_off00010b83.bin
567bee26b8081ecb325451a7e304c4dfbebf8d2f185b6621de7a69a871d03953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 10680 bytes
font_02_sfnt_off000123f9.bin
d9be6ed675582e085e8f9b785e3aa03b2ba6b678e376d275501485cccdef55a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 16172 bytes

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