Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d9675858d94214…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 15:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c59bc459bd2b168021f4e6210321bb4f SHA-1: 0331f421957cbc1bd1449321d5810f6c8221cc40 SHA-256: 66d9675858d94214d4a57cc916fcfc490b675c0ddd7e3b79c0e7fef511e15f05
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure suggests it's designed to lure users into clicking links that lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e20bf068ba902073f810d5c0c69e4cda/91825947935.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8c381937f5fb8471fc1b795eb5a697a9/jaxemovadobazoropifenu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086db0b928fc---vezokekatolajo.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/71662232303.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4361d4a3---susaxilenitoma.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/42536302081.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/55098546573.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca2536703---34845618567.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114265a2ee04---7260580849.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/48348984159.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b96de33dfed34a27a3f9e888b016fde0/zipazeded.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kug94r45ita4bqdacs8k3pa7qa/90490106851.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/3k4qqhdvv10j0lk451m3ba14ns/55209842681.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/1352716872.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/89152628440.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/91449076071.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c65c74b7b---68327643391.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/43451640214.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c1147ae92---kizolulininanoledodi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609141f43b73a---zoborezitobomuwejopevexe.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/jolozemoneruvoletofuwud.pdfIn PDF document text
    • https://digireg.es/upload/sedeviduxelipobovubifo.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210608_111953.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/sozofosisagivesusu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e831924db1---zorinuwapifoxanupon.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/tolad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lesson+grammar+english+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10804 bytes
SHA-256: ac6547dc17339040f9476e1e14f8d7d3117c3b52de8e5ed34c489fa41dcb1cab
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 18480 bytes
SHA-256: 1217b9307b9dd476399b1b34c09f1dbc0e3753ae6d2ce8636a405fb01d7cf852
font_03_sfnt_off00013fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD8 2148 bytes
SHA-256: 72ca2ef4bbbf9c80d4362c32bf3b5f07a3bbbc89ebb5cf92a5f0da21937246f8