Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c29abd3935ae92…

MALICIOUS

PDF

104.2 KB Created: 2021-07-01 11:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 05b7f6acefae4433e400f012fa5fcc93 SHA-1: bfc600385ac6b6c01a883359c5b417c8e71b45b3 SHA-256: 40c29abd3935ae929651b0edc161aa310783ae7f5f28fc409b4478119a6b810c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of these links, combined with the PDF's structure, strongly implies an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a61ba5227993514354462c4117ae9838/kikadalugik.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b91177aec---xeborutenofexu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426819ec57---tazejex.pdfIn PDF document text
    • http://parentini.it/userfiles/files/nefobefefagog.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64dd6d20b1---pawexagigizufofelu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d47270963b45bd78b4499906bfb51d9/99096226391.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073097c04afa---guziwavuvajo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fdc70dd7dbad21129dd7dc5eed5b01d0/69640760320.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/887e9adc9ba8847d9380a6f70fad23a2/315429722.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1ee9f96cff4a3dfba1393dd234122b1f/57503567915.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105260302522460.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/xewajapewafo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607624e78335b---2190345823.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b3bdcd128eb75a8ca4fa5ff318c54397/kazekizamupupeludanu.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/zoriketutojelemo.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vutalusuxilumezewurewumak.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c36c7c4524d---6473216785.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/buwusovojidatun.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/76543197901.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/mopagopedudajovo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/920a99cb2f6bc0e9d84e5f92f0a71da5/75807988750.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160be3337e484d---zosorogaxe.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16076662fe67c7---64155641990.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1adb61e63---jeroxeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ready+player+one+james+hallidayPDF 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_off00013380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 18276 bytes
SHA-256: 84582043d496f969194f549c0bbdc2b442876dc8eced73baf27c868f6ea8a128
font_01_sfnt_off000163c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD7 10848 bytes
SHA-256: c187f92d8a0898875a1047480ed63b8b66f83f1b04609bf14d423e3178e8cf32