Malicious PDF — malware analysis report

Static analysis result for SHA-256 145418150ce38440…

MALICIOUS

PDF

86.1 KB Created: 2021-08-12 18:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7c26fa6f0fba5bc50f6f3777750a55d SHA-1: c2e6b607736cf7ba2f60973bce5320007101647e SHA-256: 145418150ce38440392bf704551339efb6fda58503a6991c861adb2acf27185c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607358a4161a0---18547748454.pdf In PDF document text
    • http://urjabatteries.in/userfiles/file/gorixululi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hhj0fk197h43s1p1113pq05n46/jufakusurugas.pdfIn PDF document text
    • http://thongthien.vn/upload/files/muwebasasotojajek.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/fuworaxeroverukapinedixu.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/53722633202.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/ganakijofezupofasid.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/64284639024.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9370dae7b---nejemevunikopomiza.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b11562736---8967102621.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/soropipof.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/91646nifb6jbgsvn4sn2vbpdm1/nagegelogibameponaju.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e51a791b9c1b70300a0bf359f2bb0813/67023535471.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/28606173100.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/23629292031.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098376fa7ff1---96823294972.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/kodojovuxetetubudek.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3598036ce8---94382932462.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/losefirutikojarore.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/towefamizigudajoxete.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/vamadefuz.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/30492720875.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/tetobabasomito.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d1b83b4f596ab02b6df6fd152c732d02/nipupuzoti.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160808ba0338f4---6462963372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+size+needle+do+i+need+for+my+sewing+machinePDF 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_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 11176 bytes
SHA-256: abb136bb7abb54be535c062d0068adb128b791f294520dee65f654a4390a17b1
font_02_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 16936 bytes
SHA-256: e252078f8a72a51c1a0a696335990951e36ce7cb9144e612324b58514d94384d