Malicious PDF — malware analysis report

Static analysis result for SHA-256 7992396ecc1d996f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 15:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f60d6aca4648faedee4b55db4108a8dc SHA-1: 14b4f2816169f4e361afcdd32547bd3345a49040 SHA-256: 7992396ecc1d996fc16a039a561af06d4c541e070553dd23414d28d24f173375
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a high ML score further supports this. While no scripts were explicitly extracted, the nature of the URLs and the ClamAV detection (Pdf.Phishing.Trojan) suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=thoptv+app+live+download PDF link annotation
    • http://salt17.com/userfiles/files/gigivibol.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/27324120037.pdfIn PDF document text
    • http://aimic.com/userfiles/file/vipebedov.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/nidurupokugositono.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-10/20210910042824431420.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/90787973658.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/jenaf.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/6296414706.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/vomujis.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/q0h10jig9n3bm2f4e0f5h9clqv/nutesefixukiwodevi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f2a07e7c80060acd18c1bc8f264775ab/66307479711.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d035edaf---fakuwaj.pdfIn PDF document text
    • http://landpas.pl/upload/file/67794803285.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/jujedagilubopus.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/kokukojefufe.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/76871388133.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210915235950.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/xewekoxizutebejaxomonofap.pdfIn PDF document text
    • http://asja.ua/userfiles/file/fazujikurijotinol.pdfIn PDF document text
    • https://glozor.com/userfiles/file/92677990197.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/rojig.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210913093613.pdfIn PDF document text
    • http://artospace.com/pics/file/wowubex.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/99918929290.pdfIn PDF document text
    • https://arerp.kr/data/file///wivevunorifuwisopoweruvej.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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 18236 bytes
SHA-256: 666f8248d2775c758aacad9e530ac6de7a3cca1c0e5cd5e62ba838ec01eb7b99
font_01_sfnt_off0001165e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 10336 bytes
SHA-256: 0660808df2f286db36ba72d50cbb75b3bce64765dae44910cfd254e94c522d05

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