Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c838c3e138de74…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 01:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fead30a8b6389d4af622622cd53b80ae SHA-1: c2e7ed2763ac117badc5eb829c364f1833945f0b SHA-256: c4c838c3e138de7449606b8de4a25a30974f799bd3925d2ead03d3595c68b268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://togeltop.net/contents/files/nerirez.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0ok7mh7plco5lq30aks7oijg4r/mubiridoril.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/davotupanelukedadiw.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/mukimusaterogojenumux.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bjag539cq14grskp5j0bo7km74/36564786693.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/fufipumoxusunejatodo.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ede3ea031ae---75712422435.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/49622169570.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0669323001624755927.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/xidixulativ.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/wivotezetetaxe.pdfIn PDF document text
    • https://claudiodituri.it/uploads/99729838344.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c43dd66fae7---64758842498.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/88479359467.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b063e532090d6b43b36c3587e48df1f0/55393788293.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202108242344127264.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/26819561157.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/xemasekezilogomobi.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/kojorezavigu.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/46763816052.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/59346977322.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/24166283378.pdfIn PDF document text
    • https://retta-bg.com/userfiles/junajixanalokorikudaduku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=impacto+cultural+definicion+pdfPDF link annotation
    • 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_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 20008 bytes
SHA-256: 1b067bc4def71b30fbee51da0923154cb6ff54f2b47fd63f2b943ba4ee2917ae
font_01_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 10664 bytes
SHA-256: b7fa3f972fe2c7f73c4831deeae10444150e7869771777b001ad5c75ded89766

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