Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d958b91d3e78762…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 21:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e438b6d529edfef527f3203cc678fbb0 SHA-1: c405c9d291fc820ac618ace70ebac97f9d45123d SHA-256: 8d958b91d3e78762995800f5d161a01ec05bbcd2b5163fc96898f9488510ee80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/780cca4aff80720286f8fe48c46f94f4/keparen.pdf In PDF document text
    • http://oodow.cn/upload/file/2107050347264671806axzsusgccz5.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/43793104450.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735f5ed6208---18894896416.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/4242511131.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/33342494986.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/sobowasibuwejijugala.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcbc50c7c0---67645194742.pdfIn PDF document text
    • https://yellowstonewildlife.com/nuderexewalakotefaxuk.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072cae437b56---53911102625.pdfIn PDF document text
    • http://yjccnc.com/upload/files/19583044980.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/fivuwizure.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/pusoniguximubadoz.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/38660797912.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/77963626762.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130278b4f087---81796234044.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a01bbe93---21949244581.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ede54a1c7393ef99756894d9d62aef4e/suxebujomiziwabugu.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/vujusufavokexexeva.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a2f12864---pusababupageda.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/dunowadum.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/36946545279.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/rugikiwevatolozajig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=valve+amplifiers+4th+edition+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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 18676 bytes
SHA-256: fd287be0cd95172df515356e3636f4a1e6bb42dd327021a0cb4d3c620c8b49ab
font_01_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 10876 bytes
SHA-256: 074a2d8dcb1079a261e9699da27e81cb515ca4cb227fc6b63cf4bc1ba5c8bc47

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