Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf8bdb0ad0e2174…

MALICIOUS

PDF

87.3 KB Created: 2021-09-23 17:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67809a301686bbf7550f3e3dd907dd82 SHA-1: bb64524f9d96f665db5945efbe8f25de20bd5cee SHA-256: caf8bdb0ad0e21747aef586ac50752670e966dbeb42617fb8765347198d65361
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. An embedded JavaScript stream was also detected, which could be used to further obfuscate the malicious intent or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://cructi.ru/uplcv?utm_term=car+simulator+2+unblocked PDF link annotation
    • http://almar-bus.pl/userfiles/file/kopakagozozenofa.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/migevititinozonid.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/xibumajemenexawater.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/rokuzefijorufo.pdfIn PDF document text
    • http://metabolit.ru/files/file/nidujefapubivukakura.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109180056384426.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/39894625818.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///32262054392.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/40057029093.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/pobojatukekovurofowunudo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613158b5a0e6c---66636599391.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/75024916319.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/losape.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614682af35858---lumakodigimetinob.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ce25e8d75b801c676a41857546be5319/56010253911.pdfIn PDF document text
    • https://stara.harius.pl/app/webroot/media/files/95624818872.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c79001d203---xugulukeloduribebusujisi.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091221304273499.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/69112696491.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/96213391688.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/tofokipumikifoluv.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/gokotovap.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/73018217453.pdfIn PDF document text
    • 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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 11012 bytes
SHA-256: 3d350c18b285c2d49518887d78e2a172cc4af2ada276f5259fd6b7d6548857f7
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 19380 bytes
SHA-256: d032c45b0205d0288682de757d3b647cdb9df93900e3e875a758acf96fa79292
font_02_sfnt_off00013799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.