Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7cd45c721f8905…

MALICIOUS

PDF

106.3 KB Created: 2021-09-05 14:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb707fd1481955150d34f3588a429c7c SHA-1: e67b35e491e8ede18f2947b99e330aafd6abe8f2 SHA-256: db7cd45c721f890533267a773127a371510ad656e840c0711cdfa3e98cd899f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9139825846.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0b6497101010eb09b67114904acd157c/37816117432.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/t6qq7abirrucdbi5sk0s2tkesr/53951091262.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0434fc4693c1a044889cadd09887785b/buzudidijizub.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5798ad1b3392003e801ac3ff897155d9/fiviwa.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/11529652633.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/dokumizinekujiluzus.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/zalosubij.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/8663456715.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/boselavajawiwof.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/kusefudewuwu.pdfIn PDF document text
    • http://strahyi.ru/images/file/xesitopesinuriw.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xadidupemotixu.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/5eb050f9d3b078463bf654ed8e90038d/5543078468.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/33ec4abf9a59c5bf7cb1463daa4c10b8/5216501577.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/39597473175.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/radofixowo.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/puzafatarese.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/jogoson.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5fe9f67039a7dd202ad226bc5a2f5879/todawewawixutovediv.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/1067857791.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vigebu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4a51db62b43c493c04059e72567df574/gumil.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e743dbabd---36468100126.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05e766e49---52268154129.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609273f50d4a6---94749788773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=glencoe+math+course+3+volume+2+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_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 11288 bytes
SHA-256: 70a60aab8078913f94b294c298a0b50114c03825b14d8b3d7018cd280fe49baf
font_01_sfnt_off00014bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCA 21052 bytes
SHA-256: 207a70ba7dd4714ef61f5291ba6db20208f413aa010a563f624f2fbbf3189582
font_02_sfnt_off000182fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1