Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e44b49d470946a…

MALICIOUS

PDF

74.3 KB Created: 2021-08-03 13:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 628511be1429a0d53c5257991dec6c07 SHA-1: 74b904707de1a8067fc9e5d67900b1bc353f2c88 SHA-256: e4e44b49d470946a58518d7cfee3bc2e567b64a84713ed4b6fcf34acdf0e361a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://murito.fr/ckfinder/userfiles/files/8705546790.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/h6qmd6ju80aelgf47co0o48kue/taroturavifupikolebemon.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/siposudilo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/u9a1febuhtbe94b4n7j78djesu/8957439081.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/66667658106.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/vamovinanenojajeleli.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3d139caf---61487888385.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/soxomu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/73e83b98bccc9aa33263b52fed1a9031/dodujuwafu.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/xuwogibafapepek.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-22/20210722095712789764.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/gabavedevar.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/668cc7be437205cc72a07463923b6716/13998707531.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3239d1821d1533023fdea2b42d23c7a8/bagemegugarinepelitop.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/li7itpcekbd5k7sm3an86hu80r/93721751199.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b067f974c73---66537599343.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/49252033946.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d79578e7a42319d237d53033395f6a9/65515147275.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b245f5ccc89da07aba38dcf00e20d4f3/55591083345.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/weteraginugojijanawozij.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/bonuzarupakimop.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/fixad.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/19577320495.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/10168068741.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/o6n8iv28bc8ud2j3pv1fds0igc/zaxokodigixuwov.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d892f63ba2---nibodadamolidibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=exercices+corrig%C3%A9s+des+amplificateurs+op%C3%A9rationnels+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_off0000be41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE41 11300 bytes
SHA-256: f939785e215174e42fb39eb61e93a34f081955ba420ab86d04a68643d8926f91
font_01_sfnt_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 15572 bytes
SHA-256: 62bb8d1dc6af18c8ddfd4bcea7bd8095577af96b4dc05b354ba1b85e41b4c8b4

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