Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd22c159f6cdedca…

MALICIOUS

PDF

80.7 KB Created: 2021-08-26 01:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fdbc522e989310c827796e59aedf014 SHA-1: 4bb68ffaa9f47a9d95185a5076645b428df6ee94 SHA-256: dd22c159f6cdedca4fa45a6c75a0221a78f8f4016f3ce28ebbcd4b4e078648a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, though not directly executed in this static analysis, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thediamangroup.com/_images/files/didisaxudigudan.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/omdttc0aht39glkq6hsef9e0d0/falujilasidikeviniru.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/88106082591.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/zewunidobubin.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/34501910104.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d468edebd02---5828285123.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e96d8426226b39b12e4202ff81f0d88/3540215936.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/midamokolatorovi.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gasivubuge.pdfIn PDF document text
    • http://webursitet.org/Files/file/99643023031.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sdlqo9ph04k5hfldr9aumg9cu1/pujipadukusuwonexuluwexeg.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/n760bbu3jeqm8m5r8c2vtr1ds5/buxub.pdfIn PDF document text
    • http://wohingltd.com/userfiles/34803397301.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/mugifegowopowibibuk.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/jujotudekodo.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/sonuzerirojuj.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9ec8deea04d6f4f63341f149f8858bf4/tetonuzib.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/66810168147.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cc1dddfd78---17221554434.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/57734462467.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/m4cdl4nlam5d8mnp6n08ubfeur/topepadosejodikepur.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160888970d2e56---zedijakeresobasowidi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16093a498846b5---nodixoniposalumipajimi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e9daee4e505680c91ceba3379f0cd15b/33528870483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chemical+oceanography+pptPDF 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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 10796 bytes
SHA-256: 9e8c15f5cfc0cbd22a22e51491a6659cf793ea19524b9a8a6b16d5a51b7850cb
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 17540 bytes
SHA-256: 6c53f4bb4828d72a77609dcaa0d083f3fdcd09e0894cc6f5b41b9b206cee065c
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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