Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3cedb4703a06f3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 11:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdd70a0f91fda391671aaf40e1da14f7 SHA-1: 09250ed33aac646817fb65039f5d6c496ed33fba SHA-256: fe3cedb4703a06f3dfd0763d6b0a682279a54bf9e22186ed18024e8c45792d26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/vavoxapeju.pdf In PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/87064504370.pdfIn PDF document text
    • http://sql110.com/pic/8443528856.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/3187241080.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/jarolanatajerededu.pdfIn PDF document text
    • https://cet.sk/res/file/diwukimekexiba.pdfIn PDF document text
    • http://vladekoservis.ru/files/49600628445.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130212196676---57731945933.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7a11040d---25158273134.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/mareped.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/mawapopikowurukebuvopi.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/fitekadupolijij.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/raselekuzufisoxuri.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/mibezusugodaxufubef.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/64493569685.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210901181744.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/17236999989.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/02f53df39e6ff09c0836c464300c563b/sabitoxudosisuzuxore.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/liboduzuraxo.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/21170089354.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613836ea25b46---81376960835.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/22320565399.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/tusevaxuxubavesikozulidi.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/didalolij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=naruto+senki+5+mod+apkPDF 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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 17764 bytes
SHA-256: 0f2dbc675a89613d9f4dea2dac6993c6b8d695572b8cb94748fb663accc47398
font_01_sfnt_off00010da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA8 10808 bytes
SHA-256: 67a4620a69b3def0318f29ae4d9912caa5191165bd949d3ade44fe77e6625718
font_02_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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