Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b4c1ead54dd933…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 16:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30421a69993f80c9a6ced8a8d948a35b SHA-1: 2b03795dddc7a0f921f12bb6613eca91b62c2237 SHA-256: 55b4c1ead54dd933de51ce8d9aefe8589c2f99da61992ecf3a7747d6ea18473a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggests it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 http://www.miyadenthai.com/image/upload/File/44655591097.pdf In PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210910_4BDB1962CE2A76CB.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mmtg3buiu546u63umbeqmhav60/kuludepuxax.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/eb3eddabe18c927a7263d564f8dc5ff4/83586882161.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/21070004480.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/xalewodexukabenapelixap.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/9446413584.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/mudowudadinulega.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/91073916518.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210907154955_ftssyz.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sudewunonitukob.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/pasujigida.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/rasusenetogug.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/15719146963.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac31972b6---49894521358.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/legawiwedidi.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/wafonagoxegos.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/74521655796.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/pebetez.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/wosikobebupom.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/tubazezujora.pdfIn PDF document text
    • http://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/32454925555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=descarga+pokemon+rojo+fuego+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_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 19884 bytes
SHA-256: 9b18525f265303a94d2c4e35efafae3381601beb759a9498b69d522cbcd97814
font_01_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 11140 bytes
SHA-256: 50648ff37e1035ed5ad9f1a32ae9f3699a2f13ef43f8246087cfed8ae41c9d87
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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