Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cbb792c2593e3c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 05:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3c148de8e7de40c27dd03aaaf1ee792 SHA-1: 4466a46b6e69d2ec8e79f0f25163fbf5543479a1 SHA-256: 88cbb792c2593e3ce2f7fb00cda97264c16a366d8a878e23e395d201741355b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, which identified it as a phishing trojan. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of external URIs and the nature of the link farm indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f3998965---tasopibatij.pdf In PDF document text
    • https://nikosdimos.gr/userfiles/file/tinavasotuketiwigu.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/fudawufese.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6219ddf7ea5d6889a376fdbf4bbff6ed/sotefumagowixanuz.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/fujixonufal.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/34580550011.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/47qdnijt13pciu3rposv2kb9cj/kaxoxaxemu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0e1248277---fozalakupura.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/45516322927.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/pifupalomofala.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/06b9ae31f33acfda61b8d1c4c9e0cfe4/28233767757.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cqp2eeimsmlj5guv7hrq8930pf/55882369501.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/nokojido.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb680d691---rexerusazodorome.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21de5247d---gelikemajotesinuzopalak.pdfIn PDF document text
    • http://elsped.hu/files/file/35515583901.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/kizexutujagenisutapedakaw.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/75581806162.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56250bf8e5---85113612543.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/morexedekiguretovoxo.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/44149495561.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b1db52bb21960ec2798c43091e2584fc/87410389365.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072968134fa6---nesazitobobodi.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/59882358684.pdfIn PDF document text
    • https://onlinendttraining.com/files/26813095122.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lesuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=de+broglie+wavelength+derivation+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_off0000be76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE76 17800 bytes
SHA-256: 1e329ad9e5c8eb66e934cb5542ce782d4ddd91c98e48057f3b760b94f65dfa41
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10900 bytes
SHA-256: 631ba8318fe2627ebe93a3c30510bf18c47d86f08a798b4bf36b7daf0dcf2059
font_02_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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