Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1a2989260048d2…

MALICIOUS

PDF

82.7 KB Created: 2021-08-15 22:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8d29f57809ee20145798a4f0c521dc2 SHA-1: f9d1505efbf95aee04a8feb81aaaecc4ea953977 SHA-256: fb1a2989260048d2c0d6239b3e32a5663cccc2511c35e54e91ae91015f1224fe
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e999545becad08500a8834636b2ee22d/53270868343.pdf In PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazaxobufilebedibonoboxuj.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7be88c82---xiluguvekudogas.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607662f4d93b7---vifiwezixutekisoxexaxe.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0554a1b2---87829518035.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16093b575276d0---gonezuxipula.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/72729165515.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd906841b2f---35676456152.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/zezorujijabo.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/zunumisapumadi.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/16996732572.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d5a4fc7f97182c190160fa06708cdb2b/55741559385.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/g6qqnkubaoa15h3c6hfopn2dle/wovabipajilotibutufe.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/nekesetat.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/nipoponogefumovijubiz.pdfIn PDF document text
    • https://medtek.vn/storage/file/58310544381.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/lexigu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0fbb483d3b8643121583f87f75ec74aa/nuvosude.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/denojare.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/6358840019.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/daterumowekik.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/gaxizetiwagis.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161188e4dbf8b8---38984083060.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8nss7iu4rpsl9vaf7mrke3nt7c/24121681890.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/samosobalamopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=uss+biology+book+pdf+free+downloadPDF 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_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 11012 bytes
SHA-256: 6c9d72c729fb6b299c54180a222f3192c5c62559c206ba56dea6dd5f7a1aa7d6
font_02_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 17580 bytes
SHA-256: ce18452aceed462a4966e9ff401709e1e5d329b23425eace3fd0951bf01dabce

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