Malicious PDF — malware analysis report

Static analysis result for SHA-256 617ce8bd36ce1b5c…

MALICIOUS

PDF

97.0 KB Created: 2021-06-30 01:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d27b36d45a9d27d0fb9566521388f08 SHA-1: b49e7e563519aa08a4f96357a6dedd31cf34ca7d SHA-256: 617ce8bd36ce1b5c790124224d297a5c7180b07b06b15c7a0aa0525e13a007a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristics point towards user redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6be1765d---rofijasidijidewegewonevus.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/1705eb6258d5440cca2797188c1484d2/93568535126.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1a6108b7---76809225750.pdf
    • http://yjsyrj.com/userfiles/file/rebadik.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/87588709805.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1517cc9f9ef2c64ad9451d7e482bb84f/xezuraxaroxo.pdf
    • http://susutour.com/userfile/file/tatetopadovudof.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9470a5f3---jevowubagojibuvofejem.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43644c7c6---bipodevekoxo.pdf
    • https://aduanaldelvalle.com/userfiles/file/subotodud.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ccd0ed971---92469601001.pdf
    • https://sinhadventure.com/uploads/file/59188736940.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b990db84---dujotulujasatujorava.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b497917b98d---67573611824.pdf
    • https://led7.ru/file/diwaxowagevase.pdf
    • http://tamlaproject.com/userData/board/file/luvoxabegegorevilapa.pdf
    • http://brette-animation.com/userfiles/file/65406081731.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d6f827971db33bc0eb17db834a19d17d/49505120520.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b87bd6243c---binisikan.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca037c1cf---paposebotipifexizoru.pdf
    • http://thingsantiquesla.com/userfiles/files/65841897253.pdf
    • http://designpavelzapletal.cz/files/file/99513440232.pdf
    • https://jooli.ru/ckfinder/userfiles/files/bavamugefomiwolik.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56dc397c1d---37952999977.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/2027a3acd048da73e7add4e65f568d08/latefup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+answer+to+life+the+universe+and+everything+hitchhiker%27s+guide
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25f.bin
1b1a725a2a5ec5e7619ebbb7af0f9de138eae843d425c2254c0a6b8c5181db5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 2464 bytes
font_01_sfnt_off0000fcef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 16792 bytes
font_02_sfnt_off00011500.bin
64794009602ac6320d6f342430cb293439fbf1283c26b0c70b0cabe2bef15953
pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 16484 bytes
font_03_sfnt_off00012b94.bin
dcaaa78f5e40c6a1ae2f901e8c34f1110a1555fa11b85629bdfb9eca1203c15a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 11208 bytes
font_04_sfnt_off000145af.bin
c11fc32e14d67c624993cec57a74a1fc438264fa8f9e5f1ef1d884dc2e64be90
pdf-font-stream PDF embedded font (sfnt) at offset 0x145AF 18064 bytes