Malicious PDF — malware analysis report

Static analysis result for SHA-256 05736ad0f169a0dc…

MALICIOUS

PDF

87.8 KB Created: 2021-06-25 18:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7802bbb3a021abf97972c2d92543669 SHA-1: 7c3c38a0d41a669878a1baa2625574e2c9f77747 SHA-256: 05736ad0f169a0dc0ec3cfa33d29cd1a2d770eb964649c1807e2ef0f9f56a8df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of creating link farms on potentially untrustworthy infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://brandnewgoods.net/userfiles/file/12938336600.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63d2d4ac6---5356930388.pdf
    • http://bensonlandscape.com/editorData/file/bojubonexiwalojivikabug.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a52a21a5c---razabo.pdf
    • http://adamlegal.com/userfiles/file/nawixeposoza.pdf
    • https://iuoshili.com/upload/users/files/94940429089.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0fa1a0a09---vefetofovo.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cadc1269e---darurulosunasabawuweb.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d96985a99ec0e162fa1e4d83f6cd8c70/fanuwetemaxo.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ceb91a19b0f---31805409963.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83d67d3e1---52237239639.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e96a4d790f2dd7598fe5294cba1bff48/95523759306.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jjpa3kan2l3arn3c41e1vl3b57/82143329093.pdf
    • http://kulturazebrak.cz/userfiles/xikidozedukexekazato.pdf
    • http://amirafouad.com/uploaded_files/file/98991405296.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5ed25756570fa39874c22dc44a4d22b7/letalokinemivavejudejuw.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/jg6u13hetqcdl64nc8qsrrkdb5/41033571810.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/82abef1ace58d7068d5ed2595d8dcc57/milox.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1462a6757---42855660590.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e5894f893320e2e6416ccffe525cafce/87540047891.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a656393c9b0---12567153633.pdf
    • http://asbu.net/uploads/FCK_files/file/3734932973.pdf
    • https://paperland.bg/uploads/file/79071316940.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d9431a54---vajerutefapunifobeturu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a91af592---padelugefonipilamona.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a141dad7f95---likutosuma.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=high+and+low+fistula+in+ano
    • 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_off0000f27f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
font_01_sfnt_off00010a91.bin
35ad6d0b9bea2395f272803b550aaf34dd27905fb8d03acc5380f1e9df9f6440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 18528 bytes
font_02_sfnt_off000139e1.bin
a55efa50ddd364c02c47fe090f7dae06a838e901f19866fe3b65e734eaad0fa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139E1 10580 bytes

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