Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25188a98e51c11f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 20:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dafe5bca11e994365e82b2bcf4d1884f SHA-1: 5487ee6d2a577c98de66b34a9b40446012fa3da2 SHA-256: d25188a98e51c11fdfba0d668f9f8da99198d4b2946caa9397ba205b6ef2f207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure suggest an attempt to lure users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=difference+between+workbook+and+worksheet+vba PDF link annotation
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c31875a70---zorezakazijiwome.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/92628208827.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/fufiramuxe.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/xedufituzina.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c7851b7b---58332039711.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/ximuxu.pdfIn PDF document text
    • https://digireg.com/upload/ginunozikabanivuzasa.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/nibufivizivesarinuzezul.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1977920c---64252380838.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/zipetex.pdfIn PDF document text
    • http://haphadoor.com/upload/files/pidezedawu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881b2c465fa---xosazilosif.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/74860197916.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16095b76e5ff54---lusidinaxogenorurenudop.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/fefawelu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fe9a71ef6---visofitixexamofada.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/tetomupugadi.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/2aa7f5cfe933c01c6cbb331235405dcd/29280548724.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103626ad82a9---2885544984.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/vuliwopirisiwin.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738dffe6b6c---banasisazogefixowak.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/85450309920.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/43968472074.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/zelapotapis.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/13502413212.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_off0000c271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 17656 bytes
SHA-256: b7954cdaa1966a64a4ddee0ef60fe905c97f7d918b9e560420c6f4b4fc0db22e
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 10912 bytes
SHA-256: 7ba0e7068493683cf5eb4d4190083ad9223ec0cc35682299118763bb0417039c
font_02_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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