Malicious PDF — malware analysis report

Static analysis result for SHA-256 33391034cbc8863c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 05:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c938a61f27885790bb6e487379ea7f83 SHA-1: 98bff4da17c319c947a41576fdfec070cc3986b1 SHA-256: 33391034cbc8863ce8225aeac4c6b567a71d281580714913cc62c1f5face0394
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_BROWSER_INSTALL_LURE' heuristic. It directs users to install browser extensions or updates, a common tactic to facilitate credential theft or malware installation. The presence of multiple external URLs, some pointing to compromised WordPress sites, further supports this assessment. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=android+system+webview+app+disabled PDF link annotation
    • https://familienbilstrup.dk/ckfinder/userfiles/files/97002154964.pdfIn PDF document text
    • http://usmleworkout.com/files/file/88913985516.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/3237393393.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/tonamipexunaguxozebe.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/63794192942.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613384d1d4660---nudefisoxamipofadojubik.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/37418304158.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/52357888601.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dufiwegamuju.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/01/59535188617.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/20655584187.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/kuzarijemujiwaxixosudifol.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/6178745868.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/29107862513.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613257c077c33---bavijesiwokufujigagupeso.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134944f61805---61124223296.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/solijazogozomifegavowot.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/lelazujapipitupexozato.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/sixosipoligikuje.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/48419965158.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/061041331037.pdfIn PDF document text
    • https://begili.com/uploads/image/files/gozimiwu.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/47753483262.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_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 10940 bytes
SHA-256: df88782d3d40192f23b2f64006173161d2e76d2e4523c0396eb1302a9e4ca699
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 18072 bytes
SHA-256: 0effbc7185f18ddaed1203cb8dc9be4963c586954b26073c8339c6fc958aceb3
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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