Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7b2093c1b93caf…

MALICIOUS

PDF

101.1 KB Created: 2021-09-03 04:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56a6a069ed5f2ec0b3d0a482ebdac4a8 SHA-1: 2562435c1391323d28352da37d5c1fc22b9c2a29 SHA-256: 2f7b2093c1b93cafab230709e130683715e9c27dd88fbf96512f1cb7c4da7ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d199a5e1e---jekatoxawopabot.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6d45909c9d0b63dd1ecdf630a00edef7/66530597536.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5ef4c59e8ba0d9dd7f3244dac6bb234d/xelasirarub.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5681c13d8c98b8378b0dcaf872e8e218/37460719984.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/66ab0ae6f48c80746452883035fe8b2f/xawefaxaxot.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/9514370051.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a134f3332b9---rixag.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088409882d60---tekexunubexu.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/9878922613.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/217d48161edaa8df913eba454e1a53d4/lalogubowizixo.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1f521e91---83155995766.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d8e7d06dc3e4a133cbc1fe3184b455ca/45141620258.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f45a02783f5---gunobejavi.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/62849748872.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/5627424552.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/592b7abd37a8d628899932671f21767e/lipuvazab.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6525062de53f31467ea8eea64bfb8502/fudatekubasopagekijoz.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/sejapeva.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/waguvaferobugegoterepa.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/83068730602.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/pulofobepivoliw.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/20228972739.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/gidekipunogupopuko.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/tarolew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=normalidad+y+anormalidad+psicologica+pdfPDF 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_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E4 20412 bytes
SHA-256: a3dbcb669d85d464f49b802ff2452f3ca133f1e388ec84f69bbd53f0b54178b2
font_02_sfnt_off00016c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1F 10824 bytes
SHA-256: 4301caa985c23c76dc2b3eee53c2e53cb29f75de683fc7c1e903571420f12c7d

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