Malicious PDF — malware analysis report

Static analysis result for SHA-256 25302715fe64bba5…

MALICIOUS

PDF

87.5 KB Created: 2021-08-25 10:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1d8b901d5d9d1c59e5ff1214b702f90 SHA-1: 0d99e2e6efc8265e5818735de865eed23fca64a5 SHA-256: 25302715fe64bba50c4fbfd08d49c261348882003c6dd0df7d0b8a5feb0de15b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. This suggests the PDF is designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=rough+riders+cfl PDF link annotation
    • http://chunmianxian.com/upfolder/e/files/20210713092337.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d970045e---69468991285.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/witubozomoga.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/46448845082.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/11749490174.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/36278939561.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4el33gv6p3rvhd2tn8c54ujsn4/poxixerodo.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/luxabunirobuge.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/teketuluwaminida.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/bofif.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/6359774224.pdfIn PDF document text
    • https://bloomeng.com/uploads/52848082358.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a869d69969---lurubavij.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/bafodikip.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/fumofusi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/33695885828.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/22796765991.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/rinobowegawiniriwos.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/fed13856f0f3a61764ab6906010e9090/99585111636.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bdd6b7718bfe7db816f8c336df51470d/50355158182.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/tozegikepevepimopubabepet.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/95873906056.pdfIn PDF document text
    • https://lapdonline.org/file/26494476763.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_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 17260 bytes
SHA-256: a5995814dc4fe017cb80247e51dc88fc10886919af0ac5e0b21cc5bb45bde3e5
font_01_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 10536 bytes
SHA-256: ea79b98a52a2d9fa2c910315fa730d4c8f58aaab264c301bd34d7d4c27619104