Malicious PDF — malware analysis report

Static analysis result for SHA-256 652e1d6e2731f7c4…

MALICIOUS

PDF

100.3 KB Created: 2021-08-08 11:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9795bb7e93fd087d9e359f5a8aaf6d59 SHA-1: e604ebf9e35da96f43eb5bc5d4477d97a80f2e82 SHA-256: 652e1d6e2731f7c4f87e26464f2753f59757036727a851b7b1116cbbeb26a084
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://netron.pt/app/webroot/media/files/kifosakafejelelitikun.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/60ded0625867ea98739b7022805fe813/gomabisomufozo.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/s88qt1ps5orkmgalq67hr5tukf/lasaritibu.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bff5b683---12679754850.pdf
    • https://dienlanhbachkhoa.info/upload/files/27133947250.pdf
    • https://chemasan.lu/userfiles/files/wajedofijosavaw.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca660188e---dixudawogexivovanigisoged.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d7a4a597f3625cfa17d5937542bf1ec0/60187575692.pdf
    • http://koryosushi.com/uploads/files/dipigaj.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/wibabuxojixuvipemiwefavo.pdf
    • https://ludifrance.fr/userfiles/file/zunelibokexu.pdf
    • http://hongdanhaudio.com/luutru/files/43925024399.pdf
    • http://melinterior.ru/userfiles/files/bojoxuzegodin.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/cdfa25997b8570716ad50eb2d54d5efb/vumutoma.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0434b507---68573578916.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/bakewuwonakot.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vunevilelapibagureloze.pdf
    • http://1000projects.ru/upload_picture/file/fukatezu.pdf
    • http://hum-lucknow.org/test/fckeditor/file/38407164985.pdf
    • https://leganordavigliana.it/uploads/file/jolamokezawajovaweto.pdf
    • http://congtrinhnhaviet.vn/upload/files/fipeleteso.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c8b8f489---zogoxekisafupisorimekizas.pdf
    • http://cgl.lu/userfiles/files/wovudeduwimitoje.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h7jopnecdoh19li21f6qao6mq4/jeworuwa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=girl+scout+cookie+order+form+2019+printable+ny
    • 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_off00011ec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16792 bytes
font_01_sfnt_off000136d6.bin
7ebde8856754fa44d929d083237aa6f3108bf9dafb67962f55320eae4cba871c
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D6 18560 bytes
font_02_sfnt_off000167cc.bin
295ca9b98756cd39e93990bd5659cd8bfd5c6c18eb1d126b25aa5a1dc9060e49
pdf-font-stream PDF embedded font (sfnt) at offset 0x167CC 11728 bytes