Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1a0904e676b63a…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 06:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 574bcfc024ffd730b03ef94b37839117 SHA-1: 5843dfe5f6704c272cc749081c43d0b3f3163ce7 SHA-256: ea1a0904e676b63a4c0bec89f4f877e01ce653b8b461cac2d024ade025994825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8dc630a151d40700019e4d92c3b602f0/9577831856.pdf
    • https://deesudcoolingtower.com/userfiles/file/74031604332.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d02cbc9d0---81968538616.pdf
    • http://gardatrans.com/content/Files/56461096505.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/32c5e5f57f4d86240dfb1ca75b4673a8/kugazabisago.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072afc95f157---zadinupizimuwesawo.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c875bc061---35723715023.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf6002e69---guxevifurod.pdf
    • https://srmhospitalities.com/images/bulk_images/files/jujejazemurexifow.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae83e3c39e3---vokawafujisudafaxakaket.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160892ab85d4b4---xuxamedu.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/414dd20922d945a6d3bd2118558813fd/16093501843.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/82964995757.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/gusafirobigu.pdf
    • http://ehoron21.mn/uploads/files/vedeze.pdf
    • http://kyanite.tv/userfiles/file/72885423297.pdf
    • http://x04ydivan.ru/userfiles/file/43764346531.pdf
    • http://bandenplaats.nl/cmsimages/file/75759758948.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0419f9d8---wavuwibofuvonalam.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9e452b5de153eac328fa07c037bf0960/15504197401.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad85a6554---nuwojeletagamigelujugu.pdf
    • http://31kouqiang.com/userfiles/file/1624914598.pdf
    • http://www.sport-konyv.hu/userfiles/file/zitipurimunenuxidowera.pdf
    • http://pwr-tech.ru/userfiles/file/17581304598.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=formal+email+writing+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16792 bytes
font_01_sfnt_off000109b7.bin
5ab25efb0f1570c65b438b15d793d180321dc4eb0ec89a820e1a194e0fcfb62d
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 10736 bytes
font_02_sfnt_off00012226.bin
8229af8c582b520eca886b219237a14753b0cde757dfc099a6bcadd67e62eaed
pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 16640 bytes