Malicious PDF — malware analysis report

Static analysis result for SHA-256 51aea3cf763dd0f3…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 12:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fb8fa2b2a8d40cd0a30277a788b1c543 SHA-1: d798a0fc9ec430e37b88f30c8d1e325bc3065866 SHA-256: 51aea3cf763dd0f3030bd4adfc53e6cec56a035c06e5055f6084935736ea49f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The primary purpose seems to be redirecting users to potentially 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://infrive.ru/uplcv?utm_term=download+film+fast+and+furious+7+sub+indo PDF link annotation
    • http://colorfusion.us/admin/images/file/16825661392.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a8d8853b7f2fdb13b78ce198361ddd38/jixutodezovadepetorug.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/negeziju.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087833614f50---bawigeralojirugabut.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051516154973499.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/bokugenexexazuviv.pdfIn PDF document text
    • http://indel.sk/userfiles/file/vazatuxapepiraxoleribosi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b8384bcd5---70625977771.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7ba718b75---45977452904.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/6833049722.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/33721989842.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/28248860559.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/31614775213.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/33182022515.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836372c187d---34773836573.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/55048483501.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9f6fca30fde616887c17a512b221db00/84465211734.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/kfekelegi5q3r2i3e91h6893h2/95604679308.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/86a95277b0248af649277f5c987e5b2d/68252477849.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ae65e74d---bupasina.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/c7cf940d49dae64fdda6d78cffdf1c0f/zejaxarebufiki.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/94c831621fb0057a25a363841ca30da9/zonemebexu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d44b0cc9---69659308199.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/29638949379.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_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001171b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 10760 bytes
SHA-256: 031a84764a464ed7c3e36901c49b2618d952e19853ae768a83168dfe6644b192
font_02_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 17776 bytes
SHA-256: 2645701701a9c40b97194179e24bc3a2403d890902ce46849dc7eef12e74d685