Malicious PDF — malware analysis report

Static analysis result for SHA-256 950dbd47a9d7d8c5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 07:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39f34dcc0164be6379ab5843bd3c1254 SHA-1: be3989a1ee13dae34c21812cf8ad78127f7c8379 SHA-256: 950dbd47a9d7d8c5819800524bc801b57d960c2d755a182688e9a375958ae541
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://shuswapladystriders.ca/userfiles/file/49987790172.pdf In PDF document text
    • http://888spirits.com/userfiles/file/zipivupiz.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4fb42102f---97477300498.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/t6sh544u9st487mevu8nta5vbp/30967096325.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/ruzur.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/14330445505.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f452592b---bivabegorum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123ec51d6b97---jasuse.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0a0a07bfcdc6abf9681a8bb445ad7c37/nigufago.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/kasizakisetu.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d47b6eed0---95595821593.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/72623648151.pdfIn PDF document text
    • http://dogable.de/userfiles/file/63592637603.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0d413883---71351246214.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/jikekujiwuzuvonipowixena.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/94563121350.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3dbe9536ee18f5a6c1b6e29606c82c05/benujesevavofetax.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/9013428436.pdfIn PDF document text
    • https://davaocarrental.com/images/file/zujabepazag.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/18126788666.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4fe560f7b2851db16fa0a1cbae89b482/lorabixozijuvavobijevek.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k6l9i62kv14sjn5o58tfmbv8j0/kinarafonigarasefoxoxik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=jmp+14+tutorial+pdfPDF 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_off0000bbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDD 16572 bytes
SHA-256: e583c81a062a282a3d6118ee59f169da08f92425a31f93c44b9b901eec59ae2f
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 10476 bytes
SHA-256: da08cd3c140dab0f51ea1702c051a4963f951b8aed7fb46ce01c90b19b423659
font_02_sfnt_off0000fe1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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