Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a3c4c8e9960f95…

MALICIOUS

PDF

91.9 KB Created: 2021-08-09 17:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8861cade676ca4662e4c626627138650 SHA-1: f20916f2b92f9fded0c4a282118d518bf1666369 SHA-256: a6a3c4c8e9960f95ae751fad61a1770c456eb5656ee22e241e6ea6b7dc1b80d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://coretry.ru/uplcv?utm_term=ccf+maths+bac+pro+corrig%C3%A9+statistiques+%C3%A0+2+variables PDF link annotation
    • http://ride.hu/images/uploads/files/7579739461.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/4c624d85c316e47c13051652b944d41f/lumaxokipadojagumiwole.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608656edeff48---92243198136.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/vurelufone.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160859a7e7633b---38334983228.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/51465933680.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/79954267638.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/b0dff0ab5295e8bad5162e06275dd919/21071038929.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/mewomosukijejokize.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/peviforazuxosinodogixedas.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e855cd4---zisepatilaturoxo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09f71b6fc---wolobidorotovu.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/63996600512.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc408d85c4---53308161036.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdad2db986---2024460243.pdfIn PDF document text
    • http://learningkey.org/userfiles/gigoregujarosevirom.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210714094659.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/61123876633.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/47b59464f4c1761412eb0fa6a8f914be/kavokepuwunu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4ibergbd69m5t2frub9mjeqjs0/21381535312.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-10/images/files/lefimuxudaxepexunegiloj.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/bigawefe.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_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 19616 bytes
SHA-256: d39d6ebc5ced4a4db2702a2145fb76ff1a3764b0ba20bcda4ca79f81acf834d7
font_01_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 11764 bytes
SHA-256: 32b43014dbd2599b1d015f99031a59b19d6e3fdca2d46969dd02dde56d850fc8
font_02_sfnt_off000146a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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