Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c985d5a5f551039…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 16:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ec4df707354bd6b460b999cf24746b2 SHA-1: 9aff8db6f888de44e7a23f796faebf5d07d0d3bd SHA-256: 7c985d5a5f55103938596a5c6665154f391d45871e1f39694fdc91ffa5d72e06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users through a chain of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=10+things+i+hate+about+you+putlocker PDF link annotation
    • http://chothuexehochiminh.com/userfiles/file/37543793844.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/tosejuwerarubor.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/fozulinosulabovesisune.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/85715836468.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/libisog.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4eb557c2---valojiva.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/6526910302.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/23972099628.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b08100074119ec458c597d081800fb1f/fenapatikidisobisifedaz.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/vumuborewedebigineko.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wadelijuperodujekudut.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc34dbe02---72742547221.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/wuxuzapiremidexuxotego.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea25763e7154d646927aff20fad1ebd0/24521952339.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/jilerefelabim.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/50498531210.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/kofofanikoxabof.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/74688293340.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/bebiponutuxuvu.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/39984863327.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/78546532852.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ea3ca898---49108327191.pdfIn PDF document text
    • http://offerparts.com/upload/files/77932809547.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9e9be38e---linanu.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_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 18956 bytes
SHA-256: e50c9c9474eb2c42863e05675dd542b0aab64dde9f71793c4ed8978eed477b88
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 11176 bytes
SHA-256: 57bc56383c786df5762379df764409aaa24d88b924b9e6ad8240379dc315be53

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