Malicious PDF — malware analysis report

Static analysis result for SHA-256 751a3bc34827bfd8…

MALICIOUS

PDF

95.2 KB Created: 2021-06-27 20:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 78373730eacfd38dc1dfc2d76c3957fc SHA-1: f4426edc514580b4505b399b83c81bad3d5b1b9d SHA-256: 751a3bc34827bfd80b4b27796d288caad10af881043eab7c7302e8637c8a84b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the links point towards a tactic of directing users to potentially harmful content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://techson-cctv.com/upload/file/36482942117.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68685bb3e---61995200043.pdfIn PDF document text
    • http://accronline.com/userfiles/file/borulatikibekepazosaxekiz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/921b170c3bd85ac7e48698e7d0f95122/30771155657.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081040ee1dd1---temabisipejabukavidija.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf904377bfd---sagejeriditisununiva.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/n368k291qg54blvt2ijag4edh3/56377121245.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zapojokewukojinosuzabe.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd6037f9b---dasavalagowetifabuwegi.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc71bda3c2---pimimarepukafelisovi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1f99016eaf8a9cc12c036be7294db6a8/sigajafurupo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d554a6ba9b---lixupapob.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1620879459846253002.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caeba81ec3---ziberevivunitexatak.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/kuvuzuzu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1ca9cbb24b62c3674f6b36c1dd11475f/wejofamumamufixukaveru.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1b6bdfd6bd2e827caefe090f51f7c32b/76880690911.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xaladavifelexonetuvusi.pdfIn PDF document text
    • https://dineflon.com//files/repawuvuluniwudure.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/33385768299.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/978f347aaf08bab9893b5bbfc2d67b66/3088912451.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/jawokugabe.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92a6eebd3---vogujabojozuwilabelubotis.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/75025776081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=community+manager+discordPDF 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_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 10912 bytes
SHA-256: f42a8fc9d6395cb97b5ab1337c11fa9b62a2f52270925a556072a75f6ff3be69
font_02_sfnt_off0001433b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433B 16668 bytes
SHA-256: 96e91af9f25c06992d80a5e933ec9dbfc0ba1f0a8c4234bd8e630326638ef1c5

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