Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef01b2e7cd0febc…

MALICIOUS

PDF

93.1 KB Created: 2021-08-09 07:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26da9607391c5bd0aeb8642c436f5eab SHA-1: 61ab173731bffab9a4f67fd5494dfde74f1efccd SHA-256: 7ef01b2e7cd0febcca1baa4138e36d75ce1d5762df5b134bd6b3eef41044cb8d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the attack pattern of tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=venom+movie+free+no+sign+up PDF link annotation
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a452627c53b916b645667ef0ecae62d9/jurebepadif.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/530cbccfc4a69cf0f8aaba6189e4b9a9/99398886554.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/47200b65e1621d0da1a37745d0bc0200/25426292392.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/dataziworijuxejulusof.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/67992597557.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a327de707---fuzewibudonuga.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0mcbm8lnmjq3sqnali7dfglq16/novebexujubujesuni.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/xugirejidamilux.pdfIn PDF document text
    • http://candientuvibra.com/images/file/gubewiti.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/17508591108.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/60674419953.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6cfe67696824867baf7da6a0fbb4d928/beselitofenadopevurafibut.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vqc8e0v5d8umuq24ju9utklusg/xamowep.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/ximarafepefivoniwuj.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ecb407b16f6fa7a661669c2a226f6734/ledapatizub.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b181795d47---ronukafulutozalumisunu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160833a688ed25---5319566965.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/tafazusev.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/27348486096.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/62759765351.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e9a25f9c039a25116593f0f516c30e82/popuvowufuzojakoloratifa.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0cdcce69---61041013834.pdfIn PDF document text
    • http://nufilm.live/movie/33In 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_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 18084 bytes
SHA-256: 1fec80f5ee40b9a5eaaabab2b2c73b4ec8b508e696d250e5d7bbfd864ba01349
font_01_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 10528 bytes
SHA-256: 6d4aa14c68e715484c74f52614001a0b87461e4e499f15d8871c6c46550786c9
font_02_sfnt_off00014e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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