Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c5720117f30c3f…

MALICIOUS

PDF

96.7 KB Created: 2021-07-30 04:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f678a8c6bb860c6cbf7e5e7e5542e27a SHA-1: 58c1f59381e32da004bef0be93348af946fb9790 SHA-256: b2c5720117f30c3f3377bea273a6cd01e935095e451016ed83e2b62e11167999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ed7f19c61---50521437901.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a9f9a9b86d147dd7566af53c9b2457e6/82864357946.pdf
    • http://abwlanham.com/uploads/files/78002113029.pdf
    • http://nhs-carpediem.com/clients/46367/File/kiberabagofag.pdf
    • http://sotel-perm.ru/site/file/21934582194.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc9318fd31---xusezebemegitexo.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/cfa586a78854193c1994dd8302d63caf/45701712856.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc01868c28---lolimoro.pdf
    • http://e-hematologica.pl/users//file/deduwakokosegesemenupoxek.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/zofanugemixuwox.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd369d7623f---70139173726.pdf
    • http://nordicaluminium.ru/userfiles/file/73255774032.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/38153228350.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64d787b58---17646140504.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948eb9000ae---milazusowejidugik.pdf
    • http://4bx.pl/public/file/71857368428.pdf
    • https://digiconelectronics.com/media/9599460732.pdf
    • http://anm-av.de/uploads/files/musaxisunosemekaverakuxot.pdf
    • http://sys-svinding.dk/userfiles/file/xesalirim.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16093157ed3ae2---39259979252.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1721e1e4e---46549891905.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lm6vg41etu48b0c27m7e71rgh2/nanejigedadugesanumuwe.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/lixalil.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/m4u9orb25ctgoev1h0rusulu50/20447695717.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608612be3bbd4---wovaditevosolulewel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=descargar+la+santa+biblia+reina+valera+1960+gratis+para+pc
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa3a.bin
96b09f1d23255d0edadbd823b5f3df80d7fe10c58b7d606f71f76603ac113b9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 18844 bytes
font_01_sfnt_off00012a70.bin
4a5a98b3e12a0f83505c1ee1c2fa163c461c849794a570f7b5ecbc3c180d973b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 11148 bytes
font_02_sfnt_off0001446a.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x1446A 16164 bytes
font_03_sfnt_off000159e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x159E0 16792 bytes