Malicious PDF — malware analysis report

Static analysis result for SHA-256 781768b7375a18e9…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 08:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd6252ca3ef4e21a6aac2fbc09cc9406 SHA-1: a5924bea9c80b649331964e025d18186e07b3dec SHA-256: 781768b7375a18e9646cbf7d4fad882d1e86249578e02be91b3f5abfa5030e63
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution vehicle. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or falling victim to phishing schemes. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=vivo+ipl+2019+schedule+pdf+free+download PDF link annotation
    • http://wccflooring.com/userfiles/files/naxapa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1bdb67bf4---4028843070.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/17751861107.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/78364166500.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f9e8853a8ceb1687db4eef532ee74474/38875203616.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078efb8cab71---73499674959.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/79010375108.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kumunaborapow.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210719074241.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/bipasarumolujif.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5d7d0bf260ea45b9209a8ab6cbd80c7e/gewidasewex.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/50906606375.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/bofibetik.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf64cf2a8b---14246923936.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4n7c0pj140o43psqitk9kjmok6/vafurumerizozi.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/tetamajigarunatimeweropu.pdfIn PDF document text
    • http://sns.hu/_user/file/90674782197.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64ffc481e6---vegigemeko.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1adc253d1---61857602263.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b41fdb5c6dc5b0257a2a567d879bb76a/demoxopipavivilekuwiz.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/8485238410.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66675f2cf---norikuvonidagejipuje.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f654c43fa0---84678874100.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_off0000b63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63B 14932 bytes
SHA-256: b3878962f69a1071d6f350ae7f411a81e3860841b3eaa8851edca083a934d565
font_01_sfnt_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 11300 bytes
SHA-256: 940e49300b277ed74b427f89a6408018fa760b7ee978e31b2f65efe0dd3421c8
font_02_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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