Malicious PDF — malware analysis report

Static analysis result for SHA-256 517fe0d8244b98ed…

MALICIOUS

PDF

72.6 KB Created: 2021-06-29 00:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb6b04e2334684069d53eccff8a676d5 SHA-1: c750dbb402e992b039fd4f3805bda1f32c028e11 SHA-256: 517fe0d8244b98eda93fd55c51794c95072566d814a5f7051e486aeb04930db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of disposable hosting and compromised CMS uploads for hosting malicious content. No scripts were extracted, but the document structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://irlanc.ru/uplcv?utm_term=princess+and+the+frog+coloring PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af961a6ed85---7540217298.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/70092245711.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affb14bd48b---14108037111.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c37e807deb3---83795723495.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/manavaketogizumewavi.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/jupoxufabirekirijozibi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160859abd80ccf---monel.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/85119489628.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac17d0799---mudatozusidewanagilozate.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160989bb4e2af4---33262601240.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ne5mogn3h1gk4938a5fbloe89o/piganubiruvapigadavomi.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-15/20210515141936445130.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081da450a872---92583124212.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/de3e93bd31add510b7d06b394b23dc89/fevilaxitonewokitag.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/213oociqmairjvksdi159abl01/73936797553.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/66458432979.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/mejiwavepuvixul.pdfIn PDF document text
    • http://sun-eko.eu/files/file/mixopujisapipageniwobef.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094ed0f45cd6---xibolevesi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f46b676fca367e719010cebaa00ec968/81017717141.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/gopowajobovejewati.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/43947118939.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/fiwarubomibulize.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c348c02313f---24852268956.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/bolobolu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c99518d47---54894185375.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ca2b1cf2---17112365942.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_off0000bd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD81 15288 bytes
SHA-256: 205832624ec8bf3e5683a47e426cfc5964157b541293107a7b4f9159050fa834
font_01_sfnt_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 10756 bytes
SHA-256: 009f9681c46904958dd09d54a4b5b92f5e0210417bb2d23ef503874efc63ec47
font_02_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1