Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaa73caded335ad…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 01:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ce00ef5ca816987b7ec8e1e8b96dd31 SHA-1: c33ed8a7d481c66bbb58a2115cc026edfdaf606d SHA-256: ecaa73caded335ad582d2fe094308d701360ddfaf8b9020c48906b3473fa630b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cructi.ru/uplcv?utm_term=pain+catastrophizing+scale+pdf PDF link annotation
    • http://geoman.cz/data/file/xoliwepuja.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/89009547787.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb4129fd8---97361180702.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/nujukufijevixal.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/21529379514.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/88401829460.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/lulazilevidozokewemuwov.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/wulapasatimigonibuwow.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/71125981511.pdfIn PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/puxufoxufawarasaxugokipu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089996cc86ea---bunikin.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/476d4b7ba4e85c2a4962ff1f93364729/91423380266.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///lubirosanuv.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d2b9e38d---luxuwotun.pdfIn PDF document text
    • https://85097781.com/upload/files/pimafirani.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tsui4mrnc934ij91ju5hq3lggn/38316164423.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f74be427c406e2908391bc60e853ea67/27099159317.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/linezifezapezibalafol.pdfIn PDF document text
    • https://scalping.ir/data/files/file/25184583747.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/34429114038.pdfIn PDF document text
    • http://dentali.cz/files/files/kogekefosixawesufaradaweb.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/54766486.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8e5b3df5---1531311562.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3ddcab3dfa28e535bc3b13fe5a00878a/22253938432.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/sqhluds13gvjl4d58pfpo3k8sp/3068198872.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/wefibazigumobatasutifofo.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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 17876 bytes
SHA-256: 9054d51c713f787dab0b8717a94e1c9d7cd8e2a8cf453a0c30d8a12200ce61cc
font_01_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 10960 bytes
SHA-256: 722dace56ac2b07fb472f09e80b7113b92316c462f44d1a30c63dd3b3f411f59
font_02_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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