Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6485f495f3b056…

MALICIOUS

PDF

88.5 KB Created: 2021-09-07 09:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10b58945dc64a451fd6888b5081d50f4 SHA-1: b282b54ae986d14e8f31240b0c1f5d803d1b5ac5 SHA-256: da6485f495f3b0567940b35e12a018a949ebc7a55b69daef7c306d1caa594b62
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://sanipacific.com/attachment/file/15229243751.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5b50ec9e20d0350f121ab3e1ca2b58cc/55087310070.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fcad312a578---jikotewugewufudovifo.pdfIn PDF document text
    • https://ibericadearmerias.com/file/bosuxakegiv.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/24700688332.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/fepezevepuzaloxa.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/sukesefumajezelijimu.pdfIn PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/xojap.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/nefurozijeduzitaliniz.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/25700841157.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/57088303688.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8b08da96---koseverafomuzabetorivu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/qocev9hu9msfdb7r6gnb6ftubl/50924081216.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607305e100a4e---32474040759.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe145b3a51a---87656458774.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/vapitifozoturow.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/38f30ae624ea06e183824d44579e83db/nesesemufezogop.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/51065079851.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/dedifajidovikodaraz.pdfIn PDF document text
    • https://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/66817257974.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/39166946382.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/43409923956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+manually+delete+cookies+in+internet+explorerPDF 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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 11160 bytes
SHA-256: 65e74f21e9659c1af99220b6ebcb4b35c99e36bd2233cac63c20497118f2436b
font_01_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 18780 bytes
SHA-256: 1b414a9b003e9435a1272bda3f181d5f4b0d3cd03085e54d8e1048a1294a7c62
font_02_sfnt_off00013bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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