Malicious PDF — malware analysis report

Static analysis result for SHA-256 684a9fd7b0801a14…

MALICIOUS

PDF

89.2 KB Created: 2021-09-20 10:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7864e7473140d36d652bebd772dfdb5 SHA-1: c12d8558a12cef0dcdf8d35ec405988aae7fa6b7 SHA-256: 684a9fd7b0801a14fcb520f4411691d3ea3002a7a8e16251e7a68c58e51c11ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or phish users. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=bliss+os+12+download', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=bliss+os+12+download PDF link annotation
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/93bed41a1b78cbc89eaaf946c8007972/tagilubudejapa.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/pabonekawu.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-17-14-14-14-AkPRhq7x.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9a2cef06---55337456020.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/22735106937.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/8663155994.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/27668621931.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/44253982377.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bc4d03c4fc10abcba587fde2917f6aa2/71653446676.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210906_9D9C9F614FFF062D.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/kebaduxadapagowisatiluseg.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/51442055208.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/80020518878.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/50626804791.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/80631606267.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/gidomekisavigined.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/73189674301.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f618ee7967e7636f4eb3b3a4e97e7e0/9529743661.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/80089256449.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/66489140856.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/varivozadepa.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/31941826562.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/16545693927.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 19052 bytes
SHA-256: 8767845691b4695d12466d596f9fd7c4861a40d267b2f31d342ebdc2a8869948
font_01_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 10220 bytes
SHA-256: df705a41427c0c68a5e349de972a08354ddf007acea82466dc6e83adb0e48978
font_03_sfnt_off00013e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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