Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf19e199f44ca817…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 22:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 823cff8038512dcede4353c6abc6b6c8 SHA-1: 4c29e5a8b78baeb66c2d32f94d3adafdd1203a50 SHA-256: cf19e199f44ca8175586a05235df25e113285802faf14dbb102b58752d2f0fa4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://bajcsidavidfoto.com/_user/file/68451822678.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/044dmlnub23r7u2d5j0bm5s3s0/zovisuwomukupipeneravogo.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/45321810623.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/guxit.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f801d1eb545a340e24dd6d005f8b2423/71076505075.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/75231643311.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/vilop.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/53082377065.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/jolejawawujuretamusuk.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/56121967775.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/87382781018.pdfIn PDF document text
    • http://lukinserv.hu/file/82614536338.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/fevufexusinetufuvosereba.pdfIn PDF document text
    • http://www.og2c.com/images/file/98629068948.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/50479649979.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/7207547426.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mimimod.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/dovozofefojarikizorizabuv.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/turojege.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0f7b9b51---nazuliwanugorilofolewara.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/62503497919.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210906210801106434.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/27385534894.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/gimepuguberawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=flutter+apk+locationPDF 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 10368 bytes
SHA-256: eac13d0edd5fc501708d2a6e742981b0d1ad1727ad139eda81e3aede685b3fa4
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 17352 bytes
SHA-256: 042b07a2d8f8a3f1cf017df66a740e55be072dcf46aceffc54c2f0e4c50ae0f6

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