Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fe86e445c73520…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 19:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dad0787fb8934c302939f254d986e8c7 SHA-1: c06218ee70ebba99eb89486c28d403426a4f43f4 SHA-256: e3fe86e445c7352021269e77428d720def3d1e1cda270095dcbc14688cb4adeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=fire+tv+4k+android+version PDF link annotation
    • http://jonkmp.nl/img/cms/file/72469782060.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/fatetiwulubiwunaj.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/33789189528.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/gapedafotegoxalesekesaba.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/gifafunadugilazudelage.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/66489601533.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/g9npg3n3mpj65gss9hdqvqcv9q/xopidemi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/288b51b23f885c77ed0becd5598fa012/remil.pdfIn PDF document text
    • http://islandpointfl.com/userimages/63326653952.pdfIn PDF document text
    • https://brakos.it/file/25202772755.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/94541307505.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/zosukuwez.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/gewatodujubim.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2dc7262592a4c9a840dbeaf0ade8c4ed/xajojegobuvilir.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614239f3b1c6e---33550420314.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/tenufuxilobipero.pdfIn PDF document text
    • http://195exim.com/datas/files/modagugewitake.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/fifetipinuxitomegofutuk.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b4247761766fd8e7882ae4d379f7e109/sapepix.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/gidiwajukafekesi.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/ribonagotufebiw.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/podolulimema.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/zezudufememuxo.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/82511894978.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/89989437254.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_off0000b2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B1 14708 bytes
SHA-256: 2797337077bff7d5c6da042330b6b667582466b2f871562df844f57c0a26ea7c
font_01_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 10408 bytes
SHA-256: 7b37b28188622d1c6d82df5a558e16419311d48b384b410b37e53cceb89354c5
font_02_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1