Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f586d05e502fd8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 17:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44e899b57b1ca27a48736f5fdf2c2909 SHA-1: 9ff857eddc16decd92541cc685ad88abfd3793f8 SHA-256: d5f586d05e502fd8d646dc671c41390936d215050b863bfc2f433cec464decaf
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links to compromised websites, suggesting an attempt to trick users into downloading further malicious content or visiting phishing sites. The presence of a 'download button' heuristic further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=connect+bluetooth+keyboard+to+chromecast PDF link annotation
    • http://hungthanhauto.com/luutru/files/29815255330.pdfIn PDF document text
    • http://erex.hu/upload/file/79548886079.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/57761928669.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/lizola.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/35492189954.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/tisijuxoxivorarigabefaf.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210915203315.pdfIn PDF document text
    • http://contua.org/userfiles/file/rimekumarasigotesafaledab.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/43014155369.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/88833389678.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/73054732581.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/57114867467.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/84866690817.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131588f00d4a---91522435223.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/wikilitugeja.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/rogobopapovoxinibo.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/magisefonubodumigezumukum.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e54fd94e5f93937fb80abeb4aaff720c/70991773528.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/zufeludodisunakatamitima.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/15264892307.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/gedikenefa.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/5667892597.pdfIn PDF document text
    • http://vhz.cz/user-files/vezovepeliwe.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/rosokufap.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/27198bc626d5274efb59299c5a69d17d/77869111287.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 11020 bytes
SHA-256: 708043d50ddeb1c3f33fe640c627e3e55442ee76473bec79f53491ceff074a0b
font_01_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 18964 bytes
SHA-256: 808c2d7773abfed23d5f35f0d8ee577e487fd6fe955391f40f0c12772300dc60
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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