Malicious PDF — malware analysis report

Static analysis result for SHA-256 e918041292ef2e9e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 07:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f06aec48e27e6384a6a3e20e026bea62 SHA-1: 82e2825fecd4e97517b0484470310027fe1326a0 SHA-256: e918041292ef2e9e0e5982c3388648c52a18cec2dbae32eebf93ab03f3b9d198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=clash+of+clans+hack+original+server PDF link annotation
    • http://bndweb.nl/upload/files/78612783061.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613285a56e1ad---winubosajaxakofibawugete.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/suzoxuzumiduxejepuvul.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/53720855551.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e296251dc8---mojazavulofovusojabobu.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/58429281603.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/77189211306.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/kidenedatemizeladubinavi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a096e9d8f---mugumi.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/38120887227.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/bekuwojajakapoloku.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/73217803367.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/59230309250.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/89932634898.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/14754442182.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/zudoxuragiwoniratetenovat.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/19389284261.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/pofidegoxapetamav.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/femebusisuw.pdfIn PDF document text
    • http://xfswchem.com/upload/files/84250995205.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/12857182790.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631125805.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/12326500721.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/47430829124.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_off0000be69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE69 10704 bytes
SHA-256: 8cec0308b147959348d0c4b6c7e64289c89a3522e3a0e7d6212c169bcce17af7
font_01_sfnt_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 17392 bytes
SHA-256: 01fdf16fe2a53f1dc7463c1e61d05d780b2930304e4c7108cf48985b57d7a41a

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