Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f24ab39bb3c4e16…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 14:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 704f7e923b1e7acf4eb8ccea581a6219 SHA-1: ca1dd30148a521c8978c458aeda4f8574a8b9339 SHA-256: 8f24ab39bb3c4e16b4638bfad76f061fca54f2efe9f3aec0953e88bf13406882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites or disposable hosting. The document body is heavily obfuscated, suggesting an attempt to hide its true malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mmrh.myagenda.cz/pictures/editor/files/bukusenodubunaz.pdf In PDF document text
    • http://soluzionebenessere.eu/userfiles/files/14399578919.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/zevoxakupelutamuza.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/29780885055.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/wagutul.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/23804399180.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/35996731338.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/40163280550.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xogopadavufuje.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/46807766558.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/wenakizamutujomulamus.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_230809.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/804c8f462f7c4eb3b4b33db87f614ee4/kibetozijoririnawado.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2670c92aa91195890563fd2202c0ab0d/mejezejisimaresovemariv.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f734d0d33f---japijigidanajetusolemu.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/garonavebezodibax.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137534a24103---43125270323.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/61730993531.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/27062534177.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/ranadutete.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210906/210906202210112965r0z456h6j20z.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=calculus+3+solution+pdfPDF link annotation
    • 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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 10684 bytes
SHA-256: 154aa8ac1495d98ab814d79f91c50d926095a17e5a58930e23e64dfd93e1e925
font_02_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 19288 bytes
SHA-256: df4f6168f90ba82e62ab6dbd83045701c53f20832a01fcb0f9edeeda440fdc96