Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4fbcd7c9f13f53…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 02:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dfcf65db6fee4c658eaa679db5e2299 SHA-1: 964f7d490e34e1a2e4aef49b27fa9f924e2dee70 SHA-256: 1e4fbcd7c9f13f53f80da1de29d5c6a6b06b8a6d47403e11788cdf422ea87df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm, likely intended to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=gangster+los+santos+download PDF link annotation
    • http://hanahana.vn/media/ftp/file/laxadodidamo.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901192418230751ack8irg9k6zb.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/siwakadizavurujeguwapo.pdfIn PDF document text
    • http://cmtsport.com/pliki/30192835017.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/57399276540.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109172133527276.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/kajidomepa.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/1519111833.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614205b66070b---17048851845.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/242007553846.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/81991435109.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/lufedina.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/lexuvugisaxetazu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/21197816677.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afd753124e---baxoguberiwulugelagarugif.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f5accb7a9c261f56acdd849af882ba4d/94324292842.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/37485094581.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/jozanijonetonigezud.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/xujawi.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/73722505815.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/17288571698.pdfIn PDF document text
    • http://sbairs.com/datas/files/zijokotivixamij.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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 10456 bytes
SHA-256: 4b6d2031addabc89b355f777a9c0801993154d89ff3e04721c9d7229c5be952f
font_01_sfnt_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 17052 bytes
SHA-256: 7cb33ac048cab4b8274f013e494662daff9e0d7280dc448b2773f4ba11cd1aa7