Malicious PDF — malware analysis report

Static analysis result for SHA-256 969efab058d84d7d…

MALICIOUS

PDF

107.8 KB Created: 2021-07-31 23:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aac775aaaaab9f0ef7f560a1414cacfa SHA-1: c33e7ec70a42e600eb9deb04c667923e69dff635 SHA-256: 969efab058d84d7d5c1927c6c7610514413fc9628d0549850417461b85391c29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=apa+style+7th+edition+pdf+free PDF link annotation
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b07e5421e---87606019703.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8a87a019d7389c1c6147cfdfb30f5e01/nixoxidufabaju.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/novexepigegelowapekot.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/69244998525.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/95490380856.pdfIn PDF document text
    • https://verner.lt/images/files/galotuxaja.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a5faf5bd---19611028214.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/napagafavivigituwer.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/19873509703.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/pafanag.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079414e1892b---safat.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/28967587339.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4c9cisvckjg9ulrn4ttm06v3fd/41144737349.pdfIn PDF document text
    • https://aitalk.vn/upload/files/pepisisuzutusisudu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/mekozutek.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/runulabefo.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/12650400019.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/wezufozitan.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c22d6a2b37e---retefode.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/9411807145.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8315c61c7576fdf8f061c8d9451d2d83/90887527576.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/72825059587.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/b77d7321e19e5cb2d5f61df4b9a3f7e7.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mosemufiniwumovu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/4672812881.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_off00013fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15811 18696 bytes
SHA-256: 4c0900991577d37398d6ece094a0fce4d90de065d8cc843c8070b60515cec7be
font_02_sfnt_off000188c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C6 10740 bytes
SHA-256: 810c8df8bac39bf570e7547a336dae45e45b0556b359bd5301b8fca603f98394

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