Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffa63d771ad62b9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 12:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7b2a12a1ed5e0e5e759e4a6a103326ee SHA-1: f40c0e0ed6fc5dcb835601175110cfca884ed192 SHA-256: dffa63d771ad62b9e19beba45fca24bac5199ac0e8de85d5dd4e1843770a2197
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate it's likely used as a lure to direct users to malicious websites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=war+storm+pdf+online PDF link annotation
    • http://aqgwegfjdlk.handyfriendship.com/upload/files/getajovemij.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146d8f3da54c---fizened.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/46018941272.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9e3caa1c7bc44d4e59a8ce8ae16611aa/bugik.pdfIn PDF document text
    • https://adikketiga.com/contents/files/15845306862.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d1dc5709ed0a4b84ccf49ee45d26e46/ravugajisujutikowebag.pdfIn PDF document text
    • http://capital96.com/userfiles/file/2949730057.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/75336593785.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/giwiwowotug.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/49848441431.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/51726618977.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/givuvibagire.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xuwifobozubasilaresez.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/suvirumamikimopijafurew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb149b99b0---bisopaparasaso.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144dd98e7201---51738745761.pdfIn PDF document text
    • http://generoussecurity.com/uploads/336071252.pdfIn PDF document text
    • http://synfarm.com/upload/files/tofufato.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130817833b6b---retomapovoripu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16143e553da91d---73652197178.pdfPDF link annotation
    • https://jmclimatizacionhvac.cl/images/subidas/file/63943901501.pdfIn PDF document text
    • http://rvhifi.cz/files/file/26820487554.pdfIn PDF document text
    • https://insp.biz/img/file/89239874799.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbe4a6194---zagodowebejugulinuxivurum.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/73257143870.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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 10652 bytes
SHA-256: 6ac9805bfd7a0387658f47cb38b6ff7cd87ee15a706bd53ea9ca6d88178693a5
font_02_sfnt_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 17704 bytes
SHA-256: 549ceb2eab17fed62ef724bfa5a5376f2e125c7d928e11d751e40d832aec9fc2

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