Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08d81eb5a04fdac…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 08:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f577734e705ab947c7257348a1a1e5c2 SHA-1: 49bbe0dda3d33112c9b6e19d129fe10a9732e9fd SHA-256: e08d81eb5a04fdac14f89931b76af5ece14dee5ac2ef60a87f0fa9dbdf014362
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of numerous URLs, including those with 'utm_term' parameters, indicates an attempt to lure users to potentially harmful websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=types+of+multiplexing PDF link annotation
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e8624d0cd10---7476763759.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489a8c5526---41006940061.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210726045308_9kbafe.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085487de723d---fumifakim.pdfIn PDF document text
    • http://charivne.info/images/file/suledibujugero.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/62026332787.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/filijufelusogutizijerudi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/mivetojix.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/30176566643.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/21754531552.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c2610d87d---92361820593.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/41256248880.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c3635e18---gebubazer.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/98550219558.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42a9c0a1f---38273766495.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a623c96efd---xisiviwijobigumipoguzure.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/puvabaragiside.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ki9fu69b0flqnd5en6nob3lum9/losibogagojopil.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160707ea565fac---22452261750.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b91dd56ebb9f6a36a47062ea13c26fff/61111289295.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/90892429818.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/64881621986.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_off0000ba5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5C 15704 bytes
SHA-256: 8d64fafd1bb9777bdf4bfc37ae11839b460779fda7132d5dc61726feb894f20e
font_01_sfnt_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 10716 bytes
SHA-256: 40dd899af7d53ec2611319f59143e2aa228ed95c79a9184b531c0042527dc44a
font_02_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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