Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2aa782b88289b9c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 06:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ca12ccd33a3f435655f075702ef5d9ab SHA-1: ee1cc62e196ee510b94091ad273eb4294285ac74 SHA-256: a2aa782b88289b9cd5aeb19c85247b3e787640e5e3f1fb10e22feff1f3d7bb01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://drafthe.ru/uplcv?utm_term=easy+way+to+speak+english+in+tamil+pdf PDF link annotation
    • http://accronline.com/userfiles/file/fegusebojitat.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/nodudutaxudukenapipobinuj.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a664eaed6f4---sawudaranugexuroger.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/54656657954.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e54bc1b0ebeb039d06b3a8ba4e5c6821/zifedenola.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/xagagivipi.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210804_1E4B485D40AC656F.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/78789259321.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160872a4868ba2---wofifupase.pdfIn PDF document text
    • http://millecolori.it/images/file/jedanapoxa.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41764894279.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c152ea7e8---60349566454.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/eeoje201eoqjb3rek54927c6tr/dokijule.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/palurokawejupepubiz.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093041d17c45---75017203531.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609bece08563e---govipilofojipa.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16247685461690815604.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/dawawokarazim.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/08dcbcf82da01c8718ed76fd0fe798dc/39267687305.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/xixevazozelanegutib.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/74152891859.pdfIn PDF document text
    • 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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 11120 bytes
SHA-256: 952c3704e4296b1e920f4511aabcfe6a8607b6463fc8625573e35bdf18568685
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 17868 bytes
SHA-256: 804d8416b6743a7e9bf2672ce23f19ba5cad3af9deb2a982e1805f9b0737e177
font_02_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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