Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7af353e11dafc0…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 13:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d919963ef4466afeecc5484d4b5507d5 SHA-1: 0d1a8741ad10e463d59af3032438a1e44886bab9 SHA-256: 2a7af353e11dafc02541c79e37f433771ab95cb895a9b8fa9e35cb5e1d5c8fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains flagged as compromised or disposable, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://tessuno.com/upload/files/6137dbd111cd2.pdf In PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/17695243074.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/29344128269.pdfIn PDF document text
    • http://progetec.org/userfiles/files/kuzewila.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/29933380.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc0d3f0daf---lexojujafimajupagewe.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/51788840855.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/94469599170.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/pokevuteluzubeboker.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/lajijebenox.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/35030077925.pdfIn PDF document text
    • http://195exim.com/datas/files/5116102271.pdfIn PDF document text
    • http://rapet.hu/files/48966939733.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/6f4812957cf5ed9c8f79d56f5f062b2f/37166765577.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/fexozerexedaf.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/615066463.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/tomunuguwodaxugi.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/todogolobujofuratijab.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132b62a36e01---25183598539.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/rexevowupizadolos.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/51223276872.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/nozovux.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/barulivisumetoroze.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/pamizaligedugononipiwosil.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/18790955440.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/rarawodun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=modded+bloons+tdPDF 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_off0000aff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF0 14392 bytes
SHA-256: 0aaba68e86b9a1d0276f5538345e1b3e8c8c5a7f317e459d9b9860d4b1c9b918
font_01_sfnt_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 10020 bytes
SHA-256: d2321f506b4dd36dee69db9962c8377f568b7edd5ee19d9ac458234e606b85f8
font_02_sfnt_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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