Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3d65f456d0ae78…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 09:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae216c9263544a8d19f4b1222971b9f8 SHA-1: b8e3d5e8cff0032a8b432400ca1675dcabed8bad SHA-256: cb3d65f456d0ae781ef7508596a5a07831a2e7961fc2f0a55a3209d6a972646d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614071f7cc899---55730864014.pdf In PDF document text
    • http://sk-uralstroy.ru/uploads/files/zavadirijuletikixuvolexi.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/14373753969.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd728dfafb---5734502492.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/9928634641.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/72819769449.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441f91c4b45---fukumopolewuzafivav.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/57568758912.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/82748746146.pdfIn PDF document text
    • http://kim-clark.ru/files/file/1809173291.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fd327a957e98c0198b1b47bfeb46847b/povadogulabuwobul.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/damegi.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/79127472030.pdfIn PDF document text
    • https://medpressa.ru/files/file/97452675910.pdfIn PDF document text
    • http://hkacca.com/userfiles/jurupegapubo.pdfIn PDF document text
    • http://speckrepej.com/upload/file/tadizofimuwasu.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/39757524634.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/46569865921.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202193112322122.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/77776710484.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109051119251409.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/sefararilojikusaratakit.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/dewuxawodosufipib.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/81727288627.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/diwomuwatoradopenosobazo.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/94169643971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dumbbell+workout+at+home+mod+apkPDF 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_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 10712 bytes
SHA-256: 887cd457abb071627d3a062e2f23bae069207384233791d3d3c26b74a6509c54
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 17320 bytes
SHA-256: 9ed122d9c4cdeaab6ba0bb0310b685639fde86c6bb88c9f33e7a7ab7b37fbfea
font_02_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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