Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde64c26dd4b007b…

MALICIOUS

PDF

89.7 KB Created: 2021-07-15 11:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0545d07a714e40a43b386493221f941a SHA-1: 4e0ee5f5451b8f09b526d0378a8dcda6a0f8c2f4 SHA-256: fde64c26dd4b007bbe9e18bd785187947f8af5c14b35e5428769f461fc6eeca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=a+really+smart+person+is+called PDF link annotation
    • http://deauville.ru/files/file/totekitowopilapipusubumup.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/18480972256.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/lhbr06qdisv8j67p2bkudn1192/woliwotuzekubedoxuje.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/af5b4b264856d7019f79c52ad6962fc6/59789645078.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/qhlbl6748i5cnqo48ci03nipan/rerorejode.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/66122332269.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/jobagupavimorigesipeben.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/77274416926.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/40601062242.pdfIn PDF document text
    • http://18554080.com/userfiles/file/24780831309.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/18250031225.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3093fa641a---26233493285.pdfIn PDF document text
    • https://telenovella-bg.com/files/86804788146.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/118l9bh6onjdqvls6t8o5eg29a/kufimirojezozivusudox.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0ae603bf387b8f75ae00e65e86e874e6/mazilowel.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/saoa7m5lit6ik5vl7bsp6b6vje/padosarafokudifoko.pdfIn PDF document text
    • http://caramelitos.sk/files/20728123096.pdfIn PDF document text
    • http://aa-nusd.jp/64448307058.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/nevolenofolisevago.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/71352005448.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c9e4bfbf---gopuvaxewadixak.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2eb4b536d---suzuka.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/mivinajawazadufexetumo.pdfIn PDF document text
    • http://zxsolar.com/d/files/gavurugi.pdfIn PDF document text
    • 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_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 10768 bytes
SHA-256: 3c05470cc7b59c360d53a968bcbc3ea39f66d677a70a62b01ee3749048379a38
font_01_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 17896 bytes
SHA-256: 7f3d5edd183dd97fc4dc817f1724f7fadbadade25759487c1cdd9ef429b5e339
font_02_sfnt_off00014172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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