Malicious PDF — malware analysis report

Static analysis result for SHA-256 8862d7bd33735fd7…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 23:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d80c8abcdc89fca5fd19ed125a3632a3 SHA-1: c4b47c6d01965e6307cdbe9e250e65a9bdab8bce SHA-256: 8862d7bd33735fd7b33e1809353eff68a93663a5ff4080ec90d8b51c25c6c1e6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs pointing to compromised websites, likely intended to redirect users to malicious content or download further payloads. The document's structure, with a single image and minimal text, strongly suggests it's designed to obscure a clickable element leading to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=tingkatan+android+samsung
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/992af071df2dec244741301b31007b47/tilobuvativadexosas.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142616ff3a69---34716672545.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/35365872050.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/75430351827.pdf
    • http://cleanking.net/userData/board/file/xijagozumo.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/tawapavevanibemudujug.pdf
    • http://hide-bo.com/img/tmp/file/58322980582.pdf
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/jelapipumozo.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433ac96fedd---46850969618.pdf
    • http://haiannweb.com/uploads/files/kowozuwosonunadexiwido.pdf
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/sakizipemoguzusarajenin.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f7db4d1ac5fc832b39fbd29388fd877/suwoxurajogokabej.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/92208382409.pdf
    • http://vanlysecurity.vn/vanly/album/files/wedopepoju.pdf
    • https://deesudcoolingtower.com/userfiles/file/sipiwotexasukokapasig.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/65710466054.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/8498521920.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/97150515965.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/zujikulonovumelokagama.pdf
    • http://damnoen.com/ckfinder/pho/files/72710578203.pdf
    • http://printrun.nl/userfiles/files/takiwanagopi.pdf
    • http://www.halpellet.hu/userfiles/files/53507374545.pdf
    • http://trieuduong.com/images/Download/66768974303.pdf
    • https://cdmsig.com/ckfinder/userfiles/files/15556453803.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE2 16792 bytes
font_01_sfnt_off0000c7f9.bin
8890e47edae0733350b90892447e2fc5016c3f3a178629d0737bf4e3c07f77e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 10568 bytes
font_02_sfnt_off0000dfde.bin
61252749e05268e3d728dce8dfb9a7470d875377d4d1872e6dd678291a92dabe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 14564 bytes