Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc147d096479a38d…

MALICIOUS

PDF

81.8 KB Created: 2021-07-26 08:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddd534a4ce60ab019149c9ce3213bad4 SHA-1: e6fd90772d5af46ee7fc86831e14eccc82aaae1d SHA-256: dc147d096479a38de7fd81f6a1ffab725de07c3da5d7845cf8525a3fe468cea1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba31441d3ed---tikosekemaginafu.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/b0e1dqppgpm1a5q2vpuke29kdq/92610780801.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/10550354617.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/50b6a8ecc978f34cb204926585b8dbb3/vadikafigexanonikimip.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/pekavimakujovov.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/90680790013.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/lupapexadubuxep.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/924264674.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/6411539289.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/75723247524.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/kezixob.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/63153540633.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/pugivulutivosu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e01d62a9799---lobemutofemofakere.pdfIn PDF document text
    • https://majubesar.net/contents//files/49634188095.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/57875086560.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44a689154---71514161638.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a02204cfe---jutogamegevi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/095888001af53351e6599cf0090a0b2f/6847397292.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b69426c3e5b02a8993d924c4865458af/9562306275.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/jojofudoxasi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609654d5e54bd---75732980446.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e347526b83b---44301034542.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24774c7c7---namana.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ccfcb81b---zosadezurikubiv.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/pumagibimigibip.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ac18e5472cc262f1b21c9c3de60c1404/49254006265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+use+hh+obd+advanced+bluetooth+scan+toolPDF 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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 17384 bytes
SHA-256: c3b01c514bd0ae1970f2eb056ef5c8c92c4a8717fb9aa7788044dba32dc16fc9
font_02_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 10752 bytes
SHA-256: ee2640bd9e0a28f4d21fd16de6f190d2de439f9fbdcf9c0996edd3a286575981

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