Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a63a8e388054a9…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 17:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 27542b784bcc1f24e2cceceaf9afc756 SHA-1: e2e8fb342a1c20e9cd5f98af07afc131717a5ada SHA-256: 75a63a8e388054a9ff5cd3ba25305cdf28a4cbb0657c092746c56daa10f9ea21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. Heuristics suggest these links are used for SEO manipulation and potentially phishing or malware delivery. ClamAV detection and ML classification confirm its malicious nature, likely as a trojan designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=dutch+colonial+style+home PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608993b0790ed---80108033883.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02cce70c79---pemamejurivim.pdfIn PDF document text
    • http://usmleworkout.com/files/file/48377228980.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16086169c7f469---51165888252.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/zolulifamodabi.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/zuzaxibupifen.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/rowetagonin.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280754012185.pdfIn PDF document text
    • http://dzbnf.com/upload/file///98023720676.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd066497e---92278042352.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/mexuzatetegojofidezape.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5s94q45q81qg120a64dg4bsqco/39281189433.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/95dac14a9ba320051ed57fa4c2c11c8e/50072682988.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b9fef564be7b4f8127f66a45af5f3dcc/futer.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f698fd563815cf20ffbfc7b0095e8cfa/61264918453.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/654dca123043ee79d579d33e9e3729c3/tikofoputopop.pdfIn PDF document text
    • http://sb-78.ru/files/file/81366869316.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4f6eb57034e2b7aa26b0a165e17afe43/rasuwusir.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45635931022.pdfIn PDF document text
    • http://hotechike.com/files/files/kosapezozofededosafimewew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706ba03d59e---nekapujedokafipojoduxog.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/tazegova.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf4ee4124---5189813821.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/4407767673.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/20174073239.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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 10612 bytes
SHA-256: 48a8160bef270f225b66c4ae138f0334e13830b97686e69378a3b91f33803846
font_01_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 16836 bytes
SHA-256: c3ebde6b68901933fc942595ac045fa6d407ed2d961a0701d2dd99c988bc2d55

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