Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41c2eeb1196663e…

MALICIOUS

PDF

78.6 KB Created: 2021-06-29 09:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b0f3c5ac5c82f1fdc4cfb40e6b86e39 SHA-1: 15cb0bb24381e4c144c0fab88ea38569e1549c5d SHA-256: e41c2eeb1196663e799e1dc14de74336607d5fdb816211d4ff590a8654078b30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The presence of these links indicates an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/282bf8d585f58709b7cbb6af29735c11/pamafilijunolumavajigof.pdf In PDF document text
    • http://kimkhimientrung.com/uploads/image/files/66842406520.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c709fd7b6507bc52e2f6764a08dcec54/vatoxibiwigij.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a848a55a0b1---72471833089.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f112fbf879---vijoronepigo.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210524111003.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a439269513d---jozimal.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf6c231aa---58840161553.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f7f0e937051c8a2ff80288d5aac8f557/jufogenipap.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4d71724a6f9eff7d0122a414c975307/dukepukolurepozegi.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/fexub.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/52901644350.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/71003146921.pdfIn PDF document text
    • https://tcremich.lu/files/files/44788078963.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/8324648065.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c8d01cf6---59272074032.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/buwoj.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63efeee03f---buzifivowuwelubige.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f32f114b8---peduvoper.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87585951b7---tuwemepajibajovok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c19512c3a3---33247575955.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dipojakakelesimuvefun.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0c946f1d94f044cbf07f4c3f8fa8616/liravitagodidadag.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e6fe0afd47165ce7a08c7d090165877a/58922507309.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/83806501553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+double+space+on+canvas+discussionPDF 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_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 17144 bytes
SHA-256: 097c619eb5eb4cabcbf97d914eaf46e3ffd0c75a7609625f42e5bbf0eb2fab8c
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 10792 bytes
SHA-256: 75d69e03014019f64b99624c27ad74ff4eb9d4ffdb6330377bffaff61a30cdb5