Malicious PDF — malware analysis report

Static analysis result for SHA-256 31713f0d4ffd3fe1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 14:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89ebbae420b043031811e449749d25e8 SHA-1: 0c614eaaa202b7fe0cdff3bc09986b6fa3a9f349 SHA-256: 31713f0d4ffd3fe19fd3be700b10a095d0639f21ca0e41047ec7aa915889a619
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier also strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to lure users into malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=custom+moving+wallpaper PDF link annotation
    • https://k85shj16h-561lt.com/contents/files/52952994902.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/nigowodosenatikobipoga.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/35744271623.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/buwafifanukoz.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/zidomogekerifibevazig.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/tafeweguwi.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/wolobuvulubazutubok.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diperelimulidisa.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/79348626972.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/56520135684.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/molovumofetoziturake.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109090849193942.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/84706931693.pdfIn PDF document text
    • https://foulardfotografando.it/file/gidusokawezemizilererog.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2f07e6aa4---23796800432.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1d10a41bcce6aa31319a003c24b26863/zavatajawezak.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/36751255164.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/25216031673.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630533498.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/924cf51e04b346d628c2bba947021718/wosifanegedaxibekuge.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/boludazamojudikotedi.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/71373456786.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/jewabuxakonoligevenulaka.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/jesijukesarep.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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 17868 bytes
SHA-256: f1e1c4d4e3d116d1be733a7390f7e8e2dbfa1b6d440ab49fd89de6a36d4ea5a4
font_01_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 10880 bytes
SHA-256: 871c8ef386255a328d78508a33557f1d01a98b1480ceda88c8057d1c8419b2c8
font_02_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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