Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f33a499f8f17a5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 19:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd17e4e43c9215a2926e511486bb96e7 SHA-1: 912fe2a0600fe2c36562d66077278ecaffeda6e5 SHA-256: 29f33a499f8f17a563c1a4c00b63775cf2f46d7fc1185c69b2f31883609590cf
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structures and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1c114f4a9c71036b86deb0a843706940/23890676522.pdf In PDF document text
    • http://vlajamo.cz/images/file/zovetapovefiz.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/xojar.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a377deeb5df---38395731070.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bowoxobaziwadanigovipat.pdfIn PDF document text
    • http://quetthe.com/upload/files/1665256162.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fazozexivugunuxulurupul.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/56038284241.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160db57e7ad3fb---bapuraxulokemiwaxipirega.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/ruvogatopoginufenexizuxoj.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6e0e0085043e4a0d0de1ed5667d59772/5922034291.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/10735291466.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/juzazajezafawude.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/26589659712.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1598353a40---9700788885.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10b90941a---80075623220.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a64bb935fb---xojubadarorovatirapakuzaj.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161134869c6908---gavemowuvejuwerezuzesupaf.pdfIn PDF document text
    • http://sns.hu/_user/file/28202871004.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/11530474251.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/xigakamukoxenireposukuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=generation+one+pittacus+lore+pdf+freePDF 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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 10752 bytes
SHA-256: 9c6c7f85d3a80b610b36e65c716e1140249ff99f0ea9bc4110ea1bb8e555533d
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 18716 bytes
SHA-256: fc503f44cf00f449b362dda2207a5056b610a19b49a3425c0607f007f9ea89eb

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