Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc89b4ec0354dfd…

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 17:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc900b72d1f2114f097769c7103fc515 SHA-1: c454aca398888e88b47c09770ff329c287acf14f SHA-256: afc89b4ec0354dfd1405b3131d3f36520917e4a1a9855cf9d1c703c98e5acd99
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature, likely involving phishing or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc136153d47---22104797306.pdf
    • http://spreewaldatelier.de/img/editor/file/2240187635.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94e5716df---82181863870.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c503bc62196---38358541311.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a339308a36a---jilenagepajag.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bbd5774a3---jonotirefilaza.pdf
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/goxunirozufob.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/65224082621.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/d05b826c023c49ee9b72e7b3a4c53a61/vezadawamawefuvizogufetip.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b233de1f---fafapituvinusesuzapa.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/28300fd8f796733daed08849d666a532/bakigakuvulagesusuz.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8f086ece---59203486959.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b836a958c---kovisokukuraro.pdf
    • http://tamker.hu/userfiles/file/81863034117.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076346882e94---luwosa.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a9b8d8e234564a8d74babd333673b01f/44067734265.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16086a19572626---34063275162.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a56397428---kasuloripadubowi.pdf
    • https://epiphanych.com/images/file/20063484265.pdf
    • http://ya-ke.cn/admin/upload/saporonifizaga.pdf
    • http://kingtonkatsu.com/uploads/files/jupixopivitagozite.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c94c9dcea---wodogidunafakadenoni.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffd487b37---lanomupow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=silent+selling+5th+edition+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e271.bin
f0fe38d53df2ce3c228211e06f06f1f94e2995311f45ce30f4c3b58f390b1dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 16460 bytes
font_01_sfnt_off0000f96b.bin
a9a1f994dab005d7ac0b878b8949807c36d1d47094f1150f19f331940bf7c7d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 10724 bytes
font_02_sfnt_off000111bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 16792 bytes
font_03_sfnt_off000129ce.bin
20008979a4e958ddc742352777ece3d52b15aa8381bb583012c7388b7159c6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 17136 bytes

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