Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30552c550cca3f4…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 01:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1eb1bcdaf611f2d345ae34c2c337ac1b SHA-1: d2840553a167aad0ee4579ec9b84e69139bcc90f SHA-256: d30552c550cca3f4879b15cda32da1ece4c909db3e7c1e0f25416cfec79fd0d0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and presents as an image-only document with a click-outward action, typical of phishing lures. The document body is heavily obfuscated, but the heuristics indicate it functions as a link farm, directing users to various external URLs hosted on compromised CMS uploads and disposable domains, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 0 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://liepasmuiza.lv/userfiles/library/81990224694.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135111fc96da---44473883491.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/zutebogutagefurot.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/88r8tlkg7cqluflg8phqpf33s0/41543696910.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/26e6a7185eaef6dbfcc7ceda5d527414/kogexojavosiwinuvan.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/15326634684.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/75635385830.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/zonokesaxiguta.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/88628821516.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/94997397319.pdfIn PDF document text
    • http://origo.ws/userfiles/file/95922845661.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/kugejomoresexenezogoguza.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/13675209716.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/75850010178.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/rixilirafexu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/328bce14f87a284589f79d8d03a4e43b/gubozibafuji.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5a7d9d05ff745428f6483565c5aa8ea7/93272054574.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/kimimudobasomorideboj.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/kakakixuk.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p3gl259r2moa9afg2185uebvb3/23022234464.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/8842869466.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/dukubaketixipete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rank+checker+of+websitePDF link annotation
    • 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_off0000ad3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 14216 bytes
SHA-256: 43489f7c6bd49b2713549930f2ae7c025d0fbd314b09837babb3ea6b45636a1c
font_02_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 10748 bytes
SHA-256: 8cfe9836fbf68869b48e28f804af7e51fff1e4bec7b7e0bdef894a80b113105e

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