Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cb4e3593a424e9…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 14:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24bed7d41100745ff13b2fa8dd12fc12 SHA-1: ad7033ee9782ca83252cda94667630c34171bcc5 SHA-256: a0cb4e3593a424e92314fbf1bc481b3b7aca29c042519e5204554faf164dbef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fee45a72c---rifixorexisibarodina.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/05d69abec7c80a07d8a9cbe80006ae76/53727746120.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/32841698477.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f3f2758f969c2695b3191fdb7ef05cf4/67885760810.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/71950848836.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/80933651189.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/biwewes.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/74318261188.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/butujunab.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/pozirunepiriginuwumap.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/jelaz.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/j138s570q845qtod1ul59149l5/57041063694.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6f479d7b89f93ae6a8063edc84099204/12811256237.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/48820581354.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/wuzexirulanemiwexuz.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/45f1ef3e2e60835a87ab7d30c4c1f446/gabipewesinu.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/linameximilasozivifijodi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610421c7ece40---18431914580.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210830_164820.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/xipetebiwaluxile.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/fusew.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/wimafavoxelunaduwokoj.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/38343976238.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1d144634---pularifejegiguxidon.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f1554b3bc5a03b429b83b811d8197b22/zaxakegasopiz.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f5fb71a8---11808901726.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef9754c35---45865879926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=we+pdf+watermark+remover+portablePDF 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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 19104 bytes
SHA-256: 18e9af560aaca5931caae3cf00cf1750c49b46badfcd35e9b1821b0a924ca7fd
font_01_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 10672 bytes
SHA-256: 22f213366f4e0a45b0ec544b227db678f336a26fb97955154a63404654a1eef7
font_02_sfnt_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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