Malicious PDF — malware analysis report

Static analysis result for SHA-256 590a6f7b0e9b750e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 22:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9892450dc64d182aa831485f4a7a3233 SHA-1: 803e3314da531cebe9d77dae64811f0530f8a55f SHA-256: 590a6f7b0e9b750e98c8cc08765a03793d92b78de50b508ce3c54642a89ffa26
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content or phish for information. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=recover+files+from+internal+storage+android', are likely used to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=recover+files+from+internal+storage+android PDF link annotation
    • https://tp-pos.com/uploads/image/files/lukosur.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e591dae58f---ponov.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/12807068241.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/64270959760.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/guborafuro.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/minopisikexebi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5788df9384500e0080ea9b518d22f2d3/patizupuxe.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9692ef05---49088219397.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/1891330618.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614110aa01664---37555519225.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/sezufusijolizikusarow.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210901163053722320.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/20414901488.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/kitojipixatowimidifam.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bb0fe5d4d19e6f5256c5886ed59caddc/kapufotapobakefiluxate.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/81892641349.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/wokepopoke.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/96722103225.pdfIn PDF document text
    • http://holzweiss.at/12123297212.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be30827f2---wujebanodawifazemuxewe.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/68781388947.pdfIn PDF document text
    • http://akademibt.com/resimler/files/wewipifademu.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/tigevabuxavoputozazimi.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/90674710979.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_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 10932 bytes
SHA-256: 22957adea776385d5cae68f5508b7280a580d8fe52356b2038933e7623907395
font_02_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 17900 bytes
SHA-256: 64f71c37591b1b886b862dba575ff4727a72dff8d291d808692ff3f73d8035bc

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