Malicious PDF — malware analysis report

Static analysis result for SHA-256 3518aba4a5e1be26…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 04:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1710f0ec0566485446c5da939e9e5429 SHA-1: 55a504ee3d15ac7369b67769dde256729101a068 SHA-256: 3518aba4a5e1be26ce748da4c79eb7faf91f93c38e8b07bca3df138f08f28f90
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=partial+turner+syndrome PDF link annotation
    • http://www.vljainandco.com/userfiles/files/34166553383.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80fa69310---98790288602.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b73d43a39---2360434315.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/wuzelepuvu.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/xugakirukivuvu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/765e67403130bf1725c1cd26257f4d67/30640011172.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/vpctk7v86ihkve20h7ialbb767/puwerofofavo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/94901be18b513219e2335498dd3a4489/zurafoposofuma.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/62246030260.pdfIn PDF document text
    • http://labonscafe.com/userfiles/zopewuvufusujogubilu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/fapaxezunemag.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7226bb4a68---xoseluponipifujalijozo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe6f00209---28788272247.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d827bd2ba0---balezo.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/53678940734.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/walusexojafiwomewujig.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/pipujajijidok.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f6048689---70969565913.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jufasiniro.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/tujikogunedelekunonubok.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/romav.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/656eq8tplja85tacjtufj5gook/25893642670.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/51126830579.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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 17208 bytes
SHA-256: ed51701e9d00ec9fedfbb69359fbdd850007e8adac2c135acf689a30843b1a3e
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10624 bytes
SHA-256: f8b9933dfd4d13cad6e3bbf866e2d8187e4e2d231622ab55d2f9ff3b96b68d7d
font_02_sfnt_off00011c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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