Malicious PDF — malware analysis report

Static analysis result for SHA-256 303b0a8a2a0bc4ce…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 18:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f53a5236e7e44af7fd651c32a377c827 SHA-1: 9515399d76a637721f0caf142828e2a083856e89 SHA-256: 303b0a8a2a0bc4ce8718851b783f64a89edbcf25eb3f8fa76e72b197062637a8
176 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jingmingtai.com/filespath/files/20210915171747.pdf In PDF document text
    • http://iktoktatas.hu/files/file/97692529483.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/85487791355.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/wexapavo.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/20064333148.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/jewufisiboromavakunapawu.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/jaxukemexuwawivipebaxe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132471806305---21131323957.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/73581716350.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/kkt0ba9kepto3qjvttlduvlfgg/42197640577.pdfIn PDF document text
    • http://matras-devison.com/upload/file/xisosujikujegovapoduvor.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/16763394655.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec02902c9f---10666810842.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d84dd9f22ea969e516dbad13f883e322/27352171103.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/84357677440.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/porunekifugorepa.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/81392690605.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/48439712250.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/sagunekibiwulokosabesavo.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/wajuzovelizu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/51573311215.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/zawuko.pdfIn PDF document text
    • http://www.og2c.com/images/file/xadanimiberapefababog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=top+free+androidPDF 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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 10144 bytes
SHA-256: 3bceae612908612f3afc05e070ee5b2d75e763b694d30b0027d5bfe28dc36371
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 17296 bytes
SHA-256: ccc43c70e90de2415ae88612278468a5bf09a27b7a90f6ebbfac86a3cd9ecde7