Malicious PDF — malware analysis report

Static analysis result for SHA-256 297713b35eeed2ba…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 04:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e8066009afa3b6c9c27ae59a3d44f54 SHA-1: 7e77f4a8cdb2cda73a247df5f57d3f3fafe497f7 SHA-256: 297713b35eeed2ba717e82a28e5d9d6100aea79276931bba2728ef381146d640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple external URLs, some hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://yumasri.com/assets/ckfinder/userfiles/files/vesodepozuwafe.pdf In PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/temilepezijovelod.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133332c7af1b---29284776250.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/87955062292.pdfIn PDF document text
    • http://generoussecurity.com/uploads/97117106148.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/sexipi.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/32458471185.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/73072428435.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d01556c62---wemixebosuxawomidip.pdfIn PDF document text
    • http://kccmaul.com/files/files/81365103672.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/jetevorediwi.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/nenulatesofanazogeka.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/64358017917.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b7a5c880---70742083577.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/rumavobidokewabemevekibul.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904171426.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/36487368493.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210902001422.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/15709047014.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a5f1e252---38315839805.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/lunudeju.pdfIn PDF document text
    • http://heureka-cz.eu/files/pozexebewonibagudowuwod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=new+otome+games+2021PDF 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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 10468 bytes
SHA-256: e56b6bed82c79d0584ff6fba016edc47f04d2c60870e331316d38efaf987a392
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 16896 bytes
SHA-256: 4c6cda6aa9cfc80bc78f9ff979e901487d266f3ac9cde32f623f5d7ffff92aec
font_02_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1