Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a9160e862e344d…

MALICIOUS

PDF

107.8 KB Created: 2021-09-04 12:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fee195cd776a3c38ae06433e4cf5fc8f SHA-1: 364e1284365f3cd8c6815288f82487918c04ccac SHA-256: f8a9160e862e344dfd2fe9c77dadcbc0e513af290f6426ddc8e6e0b966c228d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://challendor.com/fckeditor/upload/file/medijavub.pdf In PDF document text
    • https://cepatdaftargroup2.com/contents//files/tovewelenopeju.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/piresuluwofalajugo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da90792536---11266480783.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/75873898554.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a8ac089a5b5e448049d8d5ceecdb646b/jigivuk.pdfIn PDF document text
    • https://actorconseil.com/files/file/4848915393.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/6829891506.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/51607433576.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/vaduwuzove.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f546338f905---73297526406.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/pokiduditotazenes.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/52635911588.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fff2ddcf8---rugozesulajadijoxofanogis.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075db07c0a41---rifanefajazorukig.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076964e90c00---5158391878.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/jedepuxubu.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/f1f518e60018b11feb334020bba6d103/73759615926.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/wajorelozuzagiw.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b0a1c16e---kuvaloperusisowexozo.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/29570056826.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/vubadevewesigi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b584847d2ef---83663277729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+overcome+communication+barriers+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_off00013f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001571e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571E 11120 bytes
SHA-256: 077144e15716316d2f9aeb118f634d326c7d43053666029b11f53bd2c90eb70a
font_02_sfnt_off000170d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D9 18792 bytes
SHA-256: 9910a3b36335d189f84eaa718bc1ec1ed32b9eca0a5f63da0af9367d07b3747f