Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b85c50a95fd2ced…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 01:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 441cbed282ef7296936aea0bf2441f6b SHA-1: b0de38c87ae7d739d00f6231e4ca8b384ddfabd2 SHA-256: 4b85c50a95fd2ced8df7ea7657bd79f37ad31684ed7c877ee38c3be28c2e9a7a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. Numerous embedded URIs point to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing campaign, likely using a spearphishing attachment as the initial access vector.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=solution+of+partial+differential+equation+pdf PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6lbujpfoum6srqn68r4r2e0a75/29353766661.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e905b46f9---gewulelosokipuxi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/529e8fbfc94ba5b864130107ee9c5cfa/kafirawefupatiterawewilaf.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c75e06b6---rajavawe.pdfPDF link annotation
    • http://animalscipublisher.com/files/upfiles/file/tufasonuxofalu.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/53721157552.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4d0a35b9f---77208623820.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9bf60b41---supexonexeboguminosij.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/tujuloxinoge.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/bugelitivowelelogi.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/12040675457.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54101079951.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5f81b3eacb3cdf9de2abe54900efe690/79915186573.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/nisiremuwegoremigazi.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/na9gdfpgunjcqekq437rvfemd2/78553121969.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/23568815263.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/27778318820.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdff69f645---nofalumuvusaluz.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8craequbo8pflb2i4839fprvok/reforosiviwanositijedodam.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a25a7ae62b9---44806722913.pdfIn PDF document text
    • http://gabortech.comadmin/file/jevomagelebezogojak.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c45bea82---folonuramekaberuw.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/854060042.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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 10644 bytes
SHA-256: b0efcb665f5b83f6f8f6deda64186bdeab86bc2ff56a28f167ab89fcf171768d
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 17540 bytes
SHA-256: 1d649d718e882491538b79bb36acb73279307e26431b207523790ea6b115af48

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