Malicious PDF — malware analysis report

Static analysis result for SHA-256 6962e5771b5ee70b…

MALICIOUS

PDF

84.5 KB Created: 2021-07-31 19:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 824d913ca08e7aca6b7f1e3f906ddbc0 SHA-1: b67984559b64f7def9bb8140dac0a924e38377b8 SHA-256: 6962e5771b5ee70bcd2ab14a4a79479c6bbcb45eea342783bc119e86fafb5f9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b753913191---21170923249.pdf In PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/bibekidut.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/77363234711.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/ratezuzunudiwimawaxirigag.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/tizimawaluxeb.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/gavl7jbkbe9nusun63q879uqon/pojezafosituk.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nijuxotewav.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/zitido.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/90605962515.pdfIn PDF document text
    • http://xn--22c6buakeib3ax0bzcc5b8tlc.com/userfiles/file/90898463582.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/vogiwuwewisamu.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210515112115.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/xobuzazotonowajox.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/sosunutufimiwowewav.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cefe569d60---latukizozawotipepaxubog.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/4e171dc47a6949b4d7c950e94851d18c/29603143046.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/wodavolebekumitamesewoje.pdfIn PDF document text
    • http://195exim.com/datas/files/famipisolovatasevubax.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/fisovitafuxipavamaj.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf61044078---pitib.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/eb53afe39d38ee4fc547572126b99dcf/48303530557.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/15570232049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+san+andreas+mod+installer+apk+for+androidPDF 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://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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 10788 bytes
SHA-256: d1cfb94ae18d46f5b017a139d6ca0df30472cb796b23ab7fe4f957cfc1cacdc1
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 16556 bytes
SHA-256: 6c6abfe15b4494611516d6667d540811037bd29b00cb0c5199a6d1c4a1e908bb