Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbc89df394ac4f2…

MALICIOUS

PDF

77.8 KB Created: 2021-08-18 11:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ca71e6c2147c5573be5b4daaf816671 SHA-1: 16067c0241f77f2eb0df71d84f10beea78333913 SHA-256: ecbc89df394ac4f28b03e39722d4b89d26d877a185e227b9e4f445aeac5c8153
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32794439140.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62c65d63e---27213198540.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/78415002111.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/71858245058.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/lodanenipuv.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b250d69a14---nobijixokopevatok.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/29ccfbaa38d5afbae749da8aecc480b3/60428655222.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160878a8b412f2---88894464780.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/gipubularu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cc28dc8c38e4219f725362f0f9c7095/88812600338.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/90012695753.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/gr088rvg07j46gg55ac8hh9pf3/sibuzisobawivevadimijab.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/wiluxepigo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f0998c111da92a1e4341002d613c68cb/pofegisif.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609493f9960f3---90636455844.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qv361q4r2eumb7ifn0h8hccn2i/jovunubataxis.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/68316c5ca34b24c5d6319b4874506641/48418121306.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/b206bm9392ud4u1891knitckil/64349058088.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/1649a00c5a8c23b86314f17dacfdcc15/sijuzobulet.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/cd89b38f0f53bce0096a4447c60054b1/488110385.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0ebb7b901f120121ab98dd8aff6c3cf7/96079167479.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/biweka.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f39022503cb05c2d20f8f9618e075015/54226775656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=holt+rinehart+and+winston+grammar+answersPDF 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_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 16912 bytes
SHA-256: f99a3cd8a083bc1dd28964e46d01009b1eea0f0c390a26ac5658f8a9e6f17a4e
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 10772 bytes
SHA-256: 94515123ec7d74688c7128cf4d38134215f592ce77cd17db3e88f444b1ac3fd8

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