Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be58180bb79c4a0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 03:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a6ad0b5bb552a9040b6ca9e710b4a17 SHA-1: 050b3eb13d0e8500ca46a68dda745cc5d0714dfa SHA-256: 1be58180bb79c4a0549340a980fc0cc93eb73d076bfa67f31313e82ee61c8389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=download+gta+chinatown+wars+apk', indicate a lure for downloading potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=download+gta+chinatown+wars+apk PDF link annotation
    • http://www.sec-ollivier-associes.fr/www/upload/file/78104972404.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/12624103676.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/vuvakiruponutunekadax.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210923075719.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/36348996567.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/66205693561.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/xogun.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424f8a5429e---36015372237.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/dibodaduderaxe.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/44034882681.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f4148cebf---72213248317.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/kusiko.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/xazesutidakukirokidotesit.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/68982690107.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109201151014268.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/82118915678.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/52301442051.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/55be2dacab3729bcb9fe556f91f788b0/kipimagu.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/wogifukesoxix.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/gitenenab.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/ponawupa.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/pilobesamisene.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/56094738958.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/13430684343.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/41939039677.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/revizizax.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_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 10840 bytes
SHA-256: f54075b997fba819906e6dec9dc1ea059b76b098209d3c7744152bf1fc9febfd
font_02_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 21420 bytes
SHA-256: 25472eb355c17a6fae5eeec1e54ed6e77138eb71ebee26a7993323909e90d821

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