Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc59ac967b0822db…

MALICIOUS

PDF

88.7 KB Created: 2021-09-20 15:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94481a014471d3394340b72cc6a3e218 SHA-1: 45ea3e3bef948aaf14e385f466bb45b641b92016 SHA-256: cc59ac967b0822db00d451edf5c59185aed0dbabe3039b1f6fe9b734d6c68ce6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a browser extension installation lure. The document contains numerous links to external sites, many hosted on compromised WordPress uploads or disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the lure and the embedded URLs point towards a social engineering attack designed to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cingenito.ca/upload/editor/file/foverubirobudutalobixikun.pdf In PDF document text
    • https://justbuymeds.net/userfiles/file/runakovafobuzelavofovom.pdfIn PDF document text
    • https://expomediainc.com/upload/file/melode.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/vabimumabimijowem.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/mafepadefuwewaxowuzu.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/6996547536.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/sojinewuvokerupofajoja.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/24587253843.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8m41dim38bcctr66qrdrfn34sq/13120695550.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/19513688731.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/jejiwobopidowixol.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/kozojatufagokaw.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/mitoxod.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/betejerebazivagagudamowiv.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/74185054665.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/dv107rit7f728m50u4blc37hg2/23168104275.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/76757838056.pdfIn PDF document text
    • http://nktrading.qa/file/files/96044548747.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/16778112652.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/99256808017.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/54385760255.pdfIn PDF document text
    • http://nfc.soo.jp/file/jakijuwugojigamim.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614827f2afe2a---mukuvuwur.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/rorare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+stop+adverts+on+my+phonePDF 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_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10776 bytes
SHA-256: ab0eb1a07fd994dde0e6f163eb9aa19b28822c5cdfa8ee32673979ac669e2922
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 19684 bytes
SHA-256: ab53f026d231d901c901fdb53db3bea897adb9b2d37278859ea9994eec6c9a39
font_02_sfnt_off00013cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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