Malicious PDF — malware analysis report

Static analysis result for SHA-256 df81701e1f2996b8…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 12:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b58f10c47e648bf55172c1e06924dbec SHA-1: 1b56871ade25ad974bca6883a9759b2c4db67341 SHA-256: df81701e1f2996b8031433daf7eaf39a6821e4910aa8ab910a5191b727268f6f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

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://nomylo.ru/uplcv?utm_term=best+lan+wifi+multiplayer+games PDF link annotation
    • https://sskundal.com/userfiles/file/81053254921.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/nukililis.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/68835628629.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/96318917084.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/75489705413.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/wumiduzegakena.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/67130121681.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318267e4a8a---luzavexixavevepadiwes.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/21477866338.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/rejukexobisarugarepuzejab.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/xutazamixej.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/53807790412.pdfIn PDF document text
    • https://taperagi.com/contents/files/posigabubisodo.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/69433750771.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7e192656faecd19a765edf8021c0ad06/91224653092.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ds2ei4t0k9n1i5s0k5gkhuo61r/durewexosizadoxefovo.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/85479837873.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/14049945401.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/dosifetuzukorujaxuz.pdfIn PDF document text
    • http://bronia.org/userfiles/file/81024201346.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/721452942a85c8e506b48f0472caec4e/57399802442.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/53961051645.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/xemabomugow.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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 17852 bytes
SHA-256: d9f6bf6ae6ee1a7a91f3d5869160db1d4acfd50633b2195dde16793af05c4bec
font_02_sfnt_off000139c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C9 10936 bytes
SHA-256: dc012401374d7af5c00b3e722112fe5ee8dc911d78cb1c0f1565154768f9b6a1

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