Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ac9b8a767b260b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 14:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea756bbd1ba7e66847682137724676da SHA-1: 9ca6425883ea508311e0ebda9c9850f78f852956 SHA-256: 20ac9b8a767b260b91ea61291b069c2e476cec831d2484def6f9a92993046916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm or redirection mechanism. The presence of external URIs and link farms indicates an attempt to direct users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=best+dj+apk PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/16e0d6c5508a43c3304fdc59fcc90008/vobafuk.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/231271153.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/90648364949.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/15434756128.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/ribakozexobigumataziwav.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/zixabikagifidag.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/toeanqcleo3v9d4h7doq72vdj4/5515197161.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1613667ff120b1---17841880504.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce50d96766---maxuwiwatusetemeduze.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/lepovox.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5588a6b7---92640959908.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/wofijej.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/sabolofiruvumelu.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/wogokuxapefamilug.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/99620742494.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/38150032743.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99d5cf3a7---ponazibo.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/24476080896.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/70172801206.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/tizizoropopegar.pdfIn PDF document text
    • https://labelmarket.eu/data/file/rinigovebawifufexurised.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63990702647.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_off0000cfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 17028 bytes
SHA-256: 960b859ec05c00a0d2e6400cae7f5887ac230840bd69b58e6f421dc00d84ee88
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 10196 bytes
SHA-256: 316de7ce35e948bb4c401ac3e4ffb64488f5cc43877b2c56de4baa07bd0f9a32
font_02_sfnt_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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