Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b792923c534c141…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 12:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62aaf7d6f46c6c75266c93457b0f6bce SHA-1: 7e81de90dd65ce7ac4919f6dbd5599cafeee358b SHA-256: 0b792923c534c14128788b73cd6644a707e3c8bd06a9c587e43f0cfe76dea4fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised WordPress upload URLs points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad65252eed2---dakewafid.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec03e574e4---rinijizerivejal.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b9b8f203---foxefojo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/58357805151.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/sizena.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2abcd458c9---vitufiw.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/litqaool3da01i2g8odf2o3dfj/debisoza.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160860256b7313---90132908874.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/valelalezizudijokad.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/81233180080.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/dqrvgdgmnt9o7f8lq9lmrakmqt/donaw.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbca6a1626---66263314789.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/662ac0e34a0667baa1635c08bfa7b5e1/25595010067.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215181030524376.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160833bd15c5e0---63008026095.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076df9cc5923---4888880798.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160756e9b84876---4009236727.pdfIn PDF document text
    • https://badrivishal.com/media/jaxabe.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ccbqqic1e6a99jtu84qb524d4h/gaxinuraletuvorasisil.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/jolor.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/smjq63osvsa3ogg1185qu99i29/26333487551.pdfIn PDF document text
    • http://royalgroup.at/tmp/75558222455.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb0218712000c6016281d3cde9c24825/42705139080.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e8ae4d50---dezigez.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/kenajujos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=baltimore+county+code+enforcement+searchPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 17408 bytes
SHA-256: 2fbb95210933dccfa5fd9bfc406e9b4f89e15f1d2e922fca38c5c52d0eaf71e6
font_01_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 11008 bytes
SHA-256: e9808e2e0dac5c69ca7281fa619e2c14840a777e84afbb1af3fa5b137d07fd73
font_02_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1