Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b14e6435e58b3b…

MALICIOUS

PDF

101.4 KB Created: 2021-08-05 02:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7e5b62652ad27a6540ba97f6aff4c8d SHA-1: e70aa98733e0a41f0cd47c557dd8328c50b5ad57 SHA-256: d4b14e6435e58b3b3f7e6db2e845851176723b4a2679b9c4e214481f0a09385e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=wedding+hashtag+generator+the+knot PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2b38ac142184ccb2bc5f0f9abc7d5f1d/jibisizasowevikotut.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f672304e243---xelimajemuxipobosunavaw.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/82006373566.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/99590621799.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609542ee9520b---wevopumimop.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/4239390139.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/mifuruzulukokuluvalekoxu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/om2ui36udagm00hnj57uqnmb85/55043261763.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/neruwawodebilixanogekusel.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0e140574c---pavugul.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/pipigosivazoxo.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/bupejuletubujelimanubirad.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b71881dcdff1ac3cfbaf17b7bd291e84/wutiziwutoribu.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/tulukuwigiwafavolet.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608106867b3f8---50726284937.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/kalogugezibididoz.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc67275e6a---bikarorafiva.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb5a4ac66---wexopi.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecad50c1e---nebibekibidafuwugox.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/31591168967.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/10435987914.pdfIn PDF document text
    • http://matras-devison.com/upload/file/38200665245.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/gikarumovumetiw.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/dagulup.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3f68646b7---46113048462.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/20ren2ekv5ohuo87ikleieav9q/jijara.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 10564 bytes
SHA-256: ec2af951c53a53c041f69198b4fe8c200b88e5398732ef64ea74c8c1b5a9c4bc
font_02_sfnt_off00013dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_03_sfnt_off000154ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154AB 19420 bytes
SHA-256: 9cb5e33bd705ac6a4c8c16e6dae116b9e25035bb1544fcbb3e72d67cf1deae16

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