Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedcc6dc21d397df…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 21:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a006aa334e4fa1b8c27a316d530f4e57 SHA-1: 7f53b2c2000e9f5be1a4e6c19a841cdcfed19a6e SHA-256: aedcc6dc21d397df9415a03b224553347f87511c178f539d2555534de80e3915
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The embedded JavaScript likely facilitates the redirection or execution of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://chcial.ru/uplcv?utm_term=anytime+organizer+app+for+android PDF link annotation
    • https://melnikhouse.com/userfiles/file/nebesadiwezerudumulab.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4c2f27b92---waxubaduxigetiz.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/wepulesi.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/94200216259.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/38766750399.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/woxibozop.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/84736302065.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/66054262157.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/45750478495.pdfIn PDF document text
    • http://neteyes.eu/editor_up/powonezazujikipoxa.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/45532846450.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/wodefojesikovat.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/zefazovenobuvopa.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/98197498104.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///39112278321.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1dbc5ab8764c93d4e1698ee538c9f449/kufafajitimuwopifarilin.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/73340231164.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/waromefax.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8fdaeaff---76886523362.pdfIn PDF document text
    • https://atlantidegattico.it/file/fafizagupagomagi.pdfIn PDF document text
    • http://climtech.com/files/files/83323073029.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/namedo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/80298418882.pdfIn PDF document text
    • http://hkalc.com/userfiles/88095775001.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/madak.pdfIn PDF document text
    • http://ave-france.com/pics/files/nagejaxowenizojamerasebak.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_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 17084 bytes
SHA-256: f7f1ea0a1d1fab2be1b0fe7bdd45e45421c2d483963746d92fd98b477563ddfc
font_01_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 10780 bytes
SHA-256: 536a2d5b41b1e77b129e9a0bfa1af9460842ceeb02db6a0b6633b80c719b3338

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