Malicious PDF — malware analysis report

Static analysis result for SHA-256 17117bbcca06fb4e…

MALICIOUS

PDF

105.8 KB Created: 2021-07-02 11:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52a9a42bc165cecf6f756a0f406f3bff SHA-1: 4f7f13d5019125cc60368a02025ec6f7ac4e3a20 SHA-256: 17117bbcca06fb4e02398abc7faa4edfb73080589005dbe5b7adf65a05d35b42
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://palcev.ru/userfiles/file/8255357802.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f39a0e94---16273058286.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ggsgrh58h0m807mlmtbt1vu5f6/58240749104.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/d0764a2dc85ad92de0459d66b7cd3db6/2843122603.pdf
    • http://curry-box-deluxe.de/userfiles/file/vugaw.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fabf5c00de0f0f442109e1f76d67cf19/37618395035.pdf
    • http://hy-concrete.ru/d/files/lagizanekuparokudapu.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/av3al3691i6argc480dgia85e9/mivabawaxufozapu.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093e0a320b48---12314515885.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608db5231d09c---63258504658.pdf
    • http://lyzebrno.cz/userfiles/file/wuzumitimutomazigemix.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/kilapinogivipiwovupok.pdf
    • https://ochronaskory.pl/pliki_user/File/xakomatulituvufugezisomef.pdf
    • https://gachbinhduong.com/upload/file/wewujadiwizusudobov.pdf
    • http://rajskiewakacje.pl/userfiles/file/39791798346.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=covetousness+in+the+bible
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6b7272ab---91995846332.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_off00013d61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 16792 bytes
font_01_sfnt_off00015578.bin
55e47905739d6bbf7888ea5d7f91ef491354f40e2af7d05eccc68427c739ac8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15578 10280 bytes
font_02_sfnt_off00016c94.bin
54fbd1e32c38678c2e9a364c27b23221e38f6ccf6a7999d45138b9b6611e6c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C94 17200 bytes

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