Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca0a9ae3816927e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 16:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba4905e5109aef80875def54027f3796 SHA-1: 6dbe3b4e4e63c238892838b3a05d92a3b103a9d6 SHA-256: 3ca0a9ae3816927ec8659587f0e1b6d23b25d0d768436a476fab54fcaa23f5fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://malbreil.com/userfiles/file/61664119896.pdf In PDF document text
    • http://hydrogears.com/survey/userfiles/files/zeludosanuxel.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/8997446002.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/gupenotukam.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/xobuwadunofiwedig.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/38836936248.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9052f5ca40811800fca3a1c145ecd47c/77445342625.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/figikuwadaruvuwonafiv.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/17761721171.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109071202155862.pdfIn PDF document text
    • http://ewtch.com/upload/files/4859282123.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/pusimi.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/85133508697.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/55232550114.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/24921977322.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/19130896245.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/15542165272.pdfIn PDF document text
    • http://centronegozi.com/public/78378258506.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/wibivitefujafipix.pdfIn PDF document text
    • http://annabarons.com/files/files/95799963863.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/21265816152.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/legojeraxeniwagofarumak.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f466b5bae9---63986422724.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/62939939689.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/90642edc005d47641e3ed88779b39bbb/jotonudozasizoladujafij.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139944e489c7---41719693543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=40+degree+to+radianPDF 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_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16484 bytes
SHA-256: d70147e45d4cb366a8c1fd503f4672e91822126dd8de99d64adc2037946128f2
font_02_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 10312 bytes
SHA-256: 6450f0dcf54b130d24114c333b8aa574e8d9b58a9c32ee9d128c6d4f09a95167

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