Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa16a7d3cf7d829…

MALICIOUS

PDF

80.5 KB Created: 2021-09-24 02:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7550dff3df82076acf752bf75fff7471 SHA-1: acfcc8906915f7923e880b9c5c204699b7a58f3b SHA-256: 7fa16a7d3cf7d829e2c37b4dcaff501d4a242c1ed2b50349d09b6689427e31f3
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a browser extension installation lure to trick users, a common social-engineering tactic. The document contains numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content or downloads. No scripts were extracted, but the overall pattern points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=all+of+my+phone+apps+keep+crashing PDF link annotation
    • http://quatanggiabao.com/images/uploads/files/gazozoxabigawu.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/97477627309.pdfIn PDF document text
    • https://ka-base.no/images_students/files/susimirepig.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/sarazeribafenujegej.pdfIn PDF document text
    • http://thaide.org/userfiles/file/80598410225.pdfIn PDF document text
    • http://bluebossa.pl/files/file/44159178933.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/39174332363.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/43203074391.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/tuxunatapasotamesiz.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/91626784058.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/64433499643.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/7326406856149b96c6fde9.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/61424498712.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135037c63626---92704970002.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/junor.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/95085309761.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3ac8fafa---kapusamunuzodokevel.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161456af9e6580---74195719853.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/xugisukekodub.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/23991726338.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/6424559131.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/46936779509.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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 11016 bytes
SHA-256: 90ace6210d65b745047f6e6e8dcd65ff367396bcb0385e89a77d248a18584b3a
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 18192 bytes
SHA-256: 24ae0f47c3e7f6c941f6ec4e196462ce009710f397b22c7349adf77cd43f277f

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