Malicious PDF — malware analysis report

Static analysis result for SHA-256 53862ddf2c8610d4…

MALICIOUS

PDF

86.2 KB Created: 2021-09-24 01:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2450837695018b6309455344a64477b9 SHA-1: 61be65cbc9598c82e8fb17fa131f1af2d7f58040 SHA-256: 53862ddf2c8610d4c137f318c97cf47139bf85e294bc68ffac8489d68636f204
172 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits multiple indicators of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to deliver a payload or redirect users to malicious content. The presence of a visual download button further supports a phishing or social engineering attack vector.

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
  • 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://nomylo.ru/uplcv?utm_term=how+can+i+play+zip+file+on+android
    • http://eiak.org/upload/editor/files/nivudofaluwuzu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411a0307c12---83297991972.pdf
    • https://beautydiction.com/ckfinder/userfiles/files/tesolabu.pdf
    • http://proreferee.ru/uploads/ckfinder/files/91923513551.pdf
    • http://doingthing.com/downloads/blog/geust/files/vitasovamuganadifof.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/aa816cb3d19ce52123ef9fe255c29ae5/57138493015.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/42343954204.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/zokanifosimorulised.pdf
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jevalasa.pdf
    • https://ukmalayalamnews.com/userfiles/file/tamamiketejerigoke.pdf
    • https://farmacieitaliane.com/documenti/file/xedonuv.pdf
    • https://z87992961.com/upload/files/20210914185332.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/minokadexufubuxedifugakef.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/23315704729.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a615da5a2---54344081085.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/18983056397.pdf
    • http://noithatvietsky.net/media/ftp/file/disodejemis.pdf
    • https://sambelteri.com/contents/files/24668259197.pdf
    • https://centralcms.coodex.net/galeria/files/duxewopeje.pdf
    • http://beijingteye.com/upload/files/16305239756.pdf
    • http://www.astmalek.cz/obrazky/file/varipaveponejokikus.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210924014330545436zhiezz.pdf
    • https://pingthye.com/userfiles/files/rawaxe.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_off0000ec97.bin
e215d88c4309a1d4f329cd73d5460a3fadfe95c47e968bf8bbc533e5bd3c0c9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 18000 bytes
font_01_sfnt_off00011adb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 16792 bytes
font_02_sfnt_off000132f2.bin
267d5865883d6965e96edd1bd42f365432f34f51399964c24217e6965f7c27d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 10596 bytes