Malicious PDF — malware analysis report

Static analysis result for SHA-256 f523aee7ce28b884…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 20:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d65b0135e52d6518359dd2341673f0f SHA-1: 59c0c8fcfed7c819b79c28189786fd08384e1815 SHA-256: f523aee7ce28b8847fdbf536f17e29afa13331d8faaf3941d789e19b10cd1204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose seems to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=ifilter+for+pdf PDF link annotation
    • http://biosite.ru/images/news/file/12082655085.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/92kfamcfos2htlqkq19tgc1qui/27551597371.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tevevojokumul.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/85850584801.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/70562407073.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/870419b52496ea4c8da924ed1c8c49dc/79180321849.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaa6a7a815---bijokemubub.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nojofebat.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/9877db208aaf02e227608a97ff401b6f/86359971338.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa903c65bef---xokodegukanaxikovenodudov.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///48591202079.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae8f225ad---ginilab.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/65417110686.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/gonapitiviwigekupelet.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dg4u1piofoq8bs80ud7f2fd660/busefulisazawigavir.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/falimogoboberisomapovuf.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/42605197885.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee84d98237---27283189390.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff95b4ce94---lozememoribifobevapo.pdfIn PDF document text
    • http://talleresjpg.es/img/file/vakevopurupewaleximoz.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/zuvije.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a42f2d95db---48990277984.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf6b8150e---jefoxesagovamelevevos.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_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 18156 bytes
SHA-256: 4847abdfa5b7724d15f96f5c5a1373c92c2c40605eab72e5dc5648c8ca2a1fb1
font_01_sfnt_off00011c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13433 10008 bytes
SHA-256: 56abb0ed2269d0531510eb74ae561301a21fadf5ef09679c8b912c8019ee6667

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