Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d8abb487a54a54…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 21:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bf062632c4b17b746289f0c284b40f4 SHA-1: 33c2719dbdf278b64fc3f9f32577591cc6dda231 SHA-256: a2d8abb487a54a547b2063fd57c0764f1ec2b360b3482344790bcaeedb490312
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The PDF structure itself contains numerous links, suggesting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rogersdesignhouse.com/uploads/files/kututezifagabokipoxewuw.pdf In PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/vujoni.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/waxeliromoxamokimu.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/wupekepofawemowiwi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091a51a18792---logekoxedoxamopopesokifa.pdfIn PDF document text
    • http://moneymaker-gold.de/files/jipanolopivoboxidodosado.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qu6otaonlin0di304fbi3f04f7/47645945986.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/19759668640.pdfIn PDF document text
    • http://dzbnf.com/upload/file///75739502369.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbe0c6477---56988547927.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/75668672936.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/kunavale.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/50604753411.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/totoguzotofa.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jfkb4j0ek36jmin5nnq75mnt0b/2897966009.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a791c0b6deb---66009951226.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612983651d29f---93096185571.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/boxibagudevidupuwidob.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/mujexagakuwubenetelurosiv.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/fatiti.pdfIn PDF document text
    • http://polletnv.be/uploads/files/15248253693.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/fijiniju.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef8926c0e9---98780566747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=emphasizing+adjective+worksheetPDF 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_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 19228 bytes
SHA-256: d13423ad59583c41295f2da6f6cea71ce8e205fe399d0a345fdae8551399216b
font_01_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 11332 bytes
SHA-256: 7c70b6d46d06e14a84eab641ba249a342d7adad1c539cefb729b0d38b7bd4861
font_02_sfnt_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1