Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7b76ec2b97ea79…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 17:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3090456c4e760e4171a4c827fc417094 SHA-1: d00b532df0354570aea3b0c610807697d526279e SHA-256: ed7b76ec2b97ea799a91a4bfad8556a8a38157992ad6f3d12c2563e6b43f3953
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links. Many of these links point to compromised WordPress sites or disposable hosting, indicating a likely phishing or malicious redirection campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eyupsifalibitkiler.com/resimler/files/xuwozewotijiveluvuz.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3ff7b1acd5c7605c1e09df98f165e3d1/54206547706.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e8f15b1ae---beniwajexugenomonoramufa.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161322762e682e---4835515877.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/96089476487.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/69946427608.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/71504075665.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/70353529798.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/2496326367.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/20579496201.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/buvixesumilomuwowutenulop.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wizeboni.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/jogopisowovuvikasu.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/80142319936.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/10794654751.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/rowukedifekumesinuwebi.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/jazemenuv.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109081949174358.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/948335f9221ac93e701d18cab885322b/63679464295.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/pozunuvuwojamova.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/12413532166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=e+sword+para+android+en+espa%C3%B1olPDF 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_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 10560 bytes
SHA-256: 29cbba620a69a7a544e63530bc2c7f89d1f9dbaa3582cacaf16f1c8283a9993b
font_01_sfnt_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 17256 bytes
SHA-256: 227330e0723aa22c05000b786b71500f5ed6f8f642b6f4e5a1052275c7ef3bd6