Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c023a79c5f4100f…

MALICIOUS

PDF

87.9 KB Created: 2021-08-13 09:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b60af57d48b15f58fc58e02fbb4c439 SHA-1: 426468565aec10565c352aebf01ac1577842d84c SHA-256: 7c023a79c5f4100fa4dd2a85b1754cca90e72fa962cbe004147c65e2baaf2198
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it uses a link farm on potentially compromised or disposable hosting, and a 'Browser extension / update installation lure' suggests social engineering to trick the user. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://reclameindex.nl/images/uploads/tinemojusenixu.pdf In PDF document text
    • http://acmemask.com/upfiles/editor/files/25681126564.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb94b7b16---71692518206.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fa642410---1038353616.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2fcce878f16fc85c6e06be28e7e59bc4/nobuzidajikupipanumuxafi.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/fe769f5a05677a89b4adb931933d431c/rimolawenuju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd3b454e8a---sinejofodelujoral.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/15728284141.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-6/20210606053321700353.pdfIn PDF document text
    • https://digireg.cz/upload/fesutepezitozabazalewizi.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/39203783181.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/g1hf6tj5b6g5cp7aiokmh0ccgd/83574213008.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/0e6b70358c2c038c27f6307655efac70/84489070955.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/15925846725.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/00416d98c94146660361bd27a4314d7b/fafutenepamuruzo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610dacbf88a9f---178034976.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/vojufoxuxejamufavifa.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/39462861825.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/jvg5a3lr4qmsleo6mqi6sgtsdt/tetisaxuxigexogapuf.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/doxaragokumedet.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zagazabekopiz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073faf50afc5---57763235812.pdfIn PDF document text
    • https://epiphanych.com/images/file/14191147452.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/87393579297.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2e0712a12d399ef2ad90fc96c4cd7838/zamatudilupigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hack+agar.io+download+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 17644 bytes
SHA-256: 62168404b1052db78e4e05229f0b3f20fbcba02ac8fec71f9027c21d8bc8441f
font_01_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 10528 bytes
SHA-256: f77137d8cbeeefd861f94cbbf785bb621eecfc68565df2f90e97bc56c83c9b76
font_02_sfnt_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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