Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c60756cdf63894…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 19:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2cbe6d4e038244e7cb1318baf052185e SHA-1: 6b29e1a8182a564ee0a036305bacd660b0ffa7d0 SHA-256: 59c60756cdf63894caeef8f5b5bf39caebef94b70397f0114009fe41467b0513
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a remote-support tool lure. The document likely aims to trick the user into downloading and installing a remote access tool, potentially for malicious purposes. The presence of numerous links to potentially compromised or disposable hosting sites suggests an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://tobn56.com/UpFiles/file/wejemabibomuwulavuk.pdf In PDF document text
    • https://textmakareknutsson.se/upload/image/zufut.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/tepunatumetunazi.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/86277349807.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be43a13a11---96540606946.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c1d2ba8abce91ff0a37e07fa714b9e61/demulirarewade.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/ribinewidukepoteguxok.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/82656279145.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/40117141843.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/741e0tbrks8ok96li2pbbd9lj6/77969402761.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/xugojawibimuj.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/zerogalam.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f78467f6066c8894821e6f1637cb0fa4/kusenurija.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/56322528607.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/66478672479.pdfIn PDF document text
    • http://dentherapia.hu/files/file/15677551290.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611646477c59f---34877264341.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e92f100335c---betalu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854aeb6860f---fugimodijozil.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/74718121702.pdfIn PDF document text
    • http://adveotec.com/img/file/59983067675.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/xaxozevuw.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/puwomasaguzabaf.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/xevazobuzizudedofewuzopo.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gajovovasedigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+translator+software+for+pcPDF 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_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 10608 bytes
SHA-256: 7fde62bd2034fc594b5f26493b511f613fcb80988ccbc679d8935cdfc23fdda7
font_01_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 18412 bytes
SHA-256: 341f455b8d392396f257c36a88436bacf0b6681f2db0af2994141526a5481723
font_02_sfnt_off00013e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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