Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26db441ea48444a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 13:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b3f8b4fbbee58c33e02b452380b348ee SHA-1: 0afed913e17b631a11951fa5ca7d6d193f81b7b2 SHA-256: b26db441ea48444aab0d305ae05553ffe16c0467cac663651578a791a471b761
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a coordinated effort to host malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tk9q1io8g9giikep3jki0cbgu5/7165082641.pdf In PDF document text
    • https://curewelldiabetes.com/userfiles/file/88242990492.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/78857980707.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wekulorazazuxibi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb3274946---66299200571.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/39563364469.pdfIn PDF document text
    • http://darstin.com/userfiles/files/jagedanitawowalip.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/wapagosikezurirunojemukix.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/rawifanizubopop.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8072700f6---xokefimopenebawazox.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/busanubuda.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/wewib.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/18476825315.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/87517220665.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/lilinu.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/temakaxe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2e8809fa7e7c9ceb4fc10781d99aa9c3/56052783733.pdfIn PDF document text
    • http://zerosquareonline.com/file/desoziwejelekowo.pdfIn PDF document text
    • http://all-premium.com/user_file/files/zotewusitugojuv.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/rusisujef.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/4047490564.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614088d393f68---21821737339.pdfIn PDF document text
    • http://talesma.com/E/file/83595211849.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/bixibujulenasu.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/dodifumapoza.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v2ng50qv4385pl34t5a187cpqj/99342235075.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/59cc1af544952eeed36a9c8c624cf669/guzobuxejekapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=copy+iphone+messages+to+androidPDF link annotation
    • 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_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 18112 bytes
SHA-256: 7676c2ebad2c517bc36193dfbe79be120cb3a8bdf196b72411decff740aab69b
font_01_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 10936 bytes
SHA-256: 756dd1ecc4589ecfab11ffe0a5131359a4bca9dcb6bf8d45c4dad2ebac5e92a3
font_02_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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