Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a66816631f5cf1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 06:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5abd19bfb66679ea86abc7d7b1e2c48 SHA-1: 7e64ee889d72f9cf835175178d1a89bd4558007c SHA-256: a8a66816631f5cf188d623a5f4e23af9b7c6b70285fda3c3e4ddc8e577c92b42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, designed to redirect users. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=assistive+touch+app+download PDF link annotation
    • http://sieuthibongda.net/ckfinder/userfiles/files/watol.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/601759b5ebb2b904a5a9d5c500ed94f0/15533116935.pdfIn PDF document text
    • https://carlojans.com/cms/file/35678850919.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6f723ba1---33355746063.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/xosutabopel.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7e41025a---forapejujutanatexaw.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/sezatusevebuwukakatawila.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/aefb221fc9a8e3f30b2c3a2f0acb31e0/56198924177.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc6aa5101e---58442252773.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/mekekufifofaze.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/mibojovokokavep.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/wulijibajebekawup.pdfIn PDF document text
    • http://bndweb.nl/upload/files/23233367422.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/94664139178.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/97055707332.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/47539066993.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/jomemabozewoniwu.pdfIn PDF document text
    • http://szcftz.com/upload/49879576387.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/46197188945.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/88439536240.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/biwijulidejumefanidus.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/33082826498.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/dokejatawugadufeterumu.pdfIn PDF document text
    • 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_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 10744 bytes
SHA-256: 1dc7bbe9b8d7ef0bf11592c7ceea6b294856550b7b8342dd12a3046e89085f6c
font_01_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 17880 bytes
SHA-256: 0c0cd49539dd0bdf59175db196fcff438bd53a20675e194b945df1ebeea103cf
font_02_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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