Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea2ce21133fc937…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 23:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7d7b863b86503e10cb8631d6139e47f SHA-1: 85b2e00cfcce8a5eb70070983af5a46bad9b230a SHA-256: 3ea2ce21133fc937c008e4cf0b8445a9ebea1e05f6b704c04c0ba32512e460fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://chowdhurytourism.com/ckfinder/userfiles/files/derekipotowemoribepevu.pdf In PDF document text
    • http://sudeoksa.com/userfiles/file/20210906030515.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/limodufimowusuvunoxa.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/lurogeniruvopuma.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/112624461.pdfIn PDF document text
    • http://www.og2c.com/images/file/nimovujof.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/bufajazu.pdfIn PDF document text
    • http://salwex.hu/file/65437283599.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xijujumodokigudi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/65289614893.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139988a2af69---60348729020.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130cef88af2e---29744395820.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/75729048198.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/gararinawufelewewuki.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/34856517186.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/36302646696.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/guzoloredazikired.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jh2inmf2eioo354ft4tiot36p3/99890195359.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/32970652688.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/3887939882.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/zaloga.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-1/20210901050815672553.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa58015d5---mogizupaxigonubuke.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/sakolaboluzadisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+pocket+edition+version+1.16PDF 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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 11004 bytes
SHA-256: 2eb059bd13673ac8f6c71a51c3a9bbbf3a3bc37b1393c4679901e4d262e52b13
font_02_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 18912 bytes
SHA-256: d2de72afd471ba0b4377e13143eadfa73621ccd984c2b0ff22596cc77fff7534

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