Malicious PDF — malware analysis report

Static analysis result for SHA-256 706bf3b21de19c87…

MALICIOUS

PDF

85.7 KB Created: 2021-08-23 13:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d90b802c9446c2dbbcc8b71c44eed953 SHA-1: 534f5c31ced18773cea80ebb2ebc3ba4da1fa301 SHA-256: 706bf3b21de19c878d48d24d16e8fe2926e0f7afc3f2366aaa5a1c5cea4fc15b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised CMS upload directories, a common technique for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://accessiblevehicleservices.com/userfiles/file/18062409244.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8642f4c814---2707908594.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/j8236d1ob54qv2c0cfb6qqkhs0/vazoxetujibenifetosukewad.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737656b775c---togelukoxulux.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/61311373693.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b3994d3d78710049d044e74c3d2e198a/30119539320.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/73977511258.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/kipozabagetetapafisir.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/nekuma.pdfIn PDF document text
    • https://digicpictures.com/downloads/jubexif.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vixax.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/bafoxobasegitubonizidev.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/obmepu7l6fbiqgm8p9nc3c8l3e/99765037045.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/p2nrlpae99e9e39khl5dfl0366/jegabinemugorotuxi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f8eca170---64426330052.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/marawitemop.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/14132755402.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0462384b6---lisuxub.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ded0507a73---nubuvezuwalutu.pdfIn PDF document text
    • http://tele-video.ru/upload/files/dolixegejuj.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/21718028373.pdfIn PDF document text
    • http://asustainable.com/global/file/jinaduwezizaliginukuj.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/jusoredo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ssg+private+equityPDF 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_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 10656 bytes
SHA-256: a4d0a01677d91018aeb6375c01cf6e1d5944ef4a991bc95913c63113cb1c3547
font_01_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 16576 bytes
SHA-256: d639adbceeb8c5fbf822b82b5774996e780bb610000d45e24385a831db3bc357
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1