Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e00710d34ffc9e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 06:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed6fc694cfd8cce41f009c676e1f8bee SHA-1: 89b5d5f97748331805adb74ef2e06267b5ceb0af SHA-256: 75e00710d34ffc9e86e3b2f7992b8ffcc80b6563e9b77b83a786956c9f7b1960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://synerhu.ru/uplcv?utm_term=international+trade+short+notes+pdf PDF link annotation
    • http://am-assets.com/aom/magnolia/userfiles/file/25750523549.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37832f748---labewisudotidefa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c003580d---zadafananiturajuxigobupo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c68f74e2a948a5cb28698529a65422ab/90990842404.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1713d82d4364ee786730bca5315457a4/paxofunodasazemeze.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/49224249281.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/panofidenuv.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/18263531680.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebuvowubutevurakimas.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/2992960f73f8fe61b9abb7c2eedbd74e/wekadofosagaritiza.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca220530fe---97560374068.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb3a9da21---4856830466.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/37345053116.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/sobazademuxebisofilet.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/goretinunixemedix.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/25316361130.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/tafexitukasotabudekapur.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/vikejigejijetamav.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/41830580979.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8c49bf56---pawipipebomebuvik.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/64424482878.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d474bd3fc0---lenovojujek.pdfIn PDF document text
    • 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_off0000bcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD9 10548 bytes
SHA-256: 326c6dee1cd0ee3a5f84a794385181a7be8fa2c069a1afc14d913d26b2a9d311
font_01_sfnt_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 15792 bytes
SHA-256: 9a2008b9e8932d958dd6e5351670102030b9f8d7ed1aa51c7a6c06f3031c284c

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