Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa15aa9433277507…

MALICIOUS

PDF

84.7 KB Created: 2021-08-17 17:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fb96b185161fbca6100c20e2969824a SHA-1: 6b04ae639efec757f2dfabd3170b3a163b42a56d SHA-256: fa15aa943327750743f75ecd9dc2a4a73fe151aff1fdff70854ccedc1e8d2853
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The presence of embedded JavaScript suggests it may be used to execute malicious code or redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=what+subscriptions+offer+student+discounts PDF link annotation
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/36b229f848c484a28e966a7c2a701b7b/wimidipiwazipivemojenabo.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/82623171393.pdfIn PDF document text
    • https://topupdana.com/contents//files/duvitoberumodu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/96614890799.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e616313431---36865229867.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/rabimuzexewemozuj.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/bajudukaxodileretelut.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mosutorisox.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ee1b7275c---fewosawinudigefelufete.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/77425298184.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/s37dgcfn9t3lfup6e7a0bfsoi5/39080614511.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac3ff1e93---nufodi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609239b6d8474---76206601484.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d86f29323927217c01418e98f93c1fbb/jikarivegetame.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/94439302909.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/bafufofupex.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c6896a88e---zegigurutimibuvuradutonap.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/penijudatexikab.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/defojosifow.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/977ab6d4a7e302c30388b1ab5ffbd4aa/63021303674.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/gizasutujuniwumase.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hhe2udr6likt2gbqk81v2jgoha/jepomejisu.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/96326784462.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/jaxixotetegogojugune.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077585d377a0---47273421820.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/5640487099.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/30835631079.pdfIn PDF document text
    • http://allycatering.com/userfiles/8219357625.pdfIn PDF document text
    • 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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 17248 bytes
SHA-256: 77ba0fff5fc75193d725de60b08200b3a9d0af988468e69445a9f113bca9f146
font_02_sfnt_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 10904 bytes
SHA-256: 8b2f1a90933e152446b3df41f35d53ddd87a37794dd417784f8e64a3c0576534

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