Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab348788dc4626c…

MALICIOUS

PDF

97.9 KB Created: 2021-09-19 20:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1a3a6c8b932fde2a64ee006bce10141f SHA-1: 45b210e49f466c7d900619b2c22c7ba33b9754ad SHA-256: 4ab348788dc4626c10bffcf3ad827394a67c3951cac76d2226b4ed6624b77f40
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for credential theft or malware delivery. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports a malicious intent. ClamAV detection and ML classification confirm its malicious nature, likely acting as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=save+tabs+chrome+android PDF link annotation
    • https://atasuorganiktarim.com/upload/ckfinder/files/16843578713.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/82864024896.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/35247970830.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/67118536851.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/bolataxugo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384ee48e21e---wajiwuvoraf.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/lojivopibufomumazet.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6eb75c2f---6812318513.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/posevisi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bd2f478d685d2a0bea4dc8926cd49038/jifalupozedunawi.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/zasitidur.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/71010836614.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/dusumolexabokojameporoja.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/88410732444.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/ziriziluzufo.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/fimuferujajebigabuzo.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/94768192362.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/papurodigeboteg.pdfIn PDF document text
    • http://halaljones.com/uploads/files/tobujodufuduzovitata.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/uk3h9msl8b7lbavr70ltqq3me3/42202326359.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/39090094395.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8d7ddd1d2---nijogeginekawegofekixunis.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/mivefujopazowuwason.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/guganava.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///fopibe.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/tofarugewote.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/12967721457.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_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 19152 bytes
SHA-256: 8962560afe27e56f91a2e02ec43a5420390f3179c7a4253a13adaff202150a33
font_01_sfnt_off000148ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BA 10868 bytes
SHA-256: e2cfc9eefa455984530c13e91a1ea8c84572f81a28ed9d20a9c7fa0a7b144a22
font_02_sfnt_off000161a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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