Malicious PDF — malware analysis report

Static analysis result for SHA-256 451c25d0ed51901d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 00:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 552256012f21b7cf0ea2798f1a9a1414 SHA-1: ecbb9fc39c03eda889044b0bb054c7e700b80c64 SHA-256: 451c25d0ed51901dd334fbbe68212ac8882518b16826938f2ef6db199ac09f76
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://keralatemples.info/ckfinder/userfiles/files/fusimevupureted.pdf In PDF document text
    • http://abwingssuffolk2.com/uploads/files/kugumebepizelila.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/pikinisuzorozejuvitenubok.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/86655203522.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/fazoxunovulij.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/wudenesidamibazuxade.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/50230163809.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/rokatedezexipovev.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7918048394ef2028f312035871ab6094/mezefawavipojuledoleteg.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/78109032685.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/f7efe3ho48a3519ac3rokhm6b5/77902922151.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161392d29b923c---wiwalinojotid.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/svdaos6lg4bjpllde44fpn97s2/44413223283.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/85541227175.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/ponabusebagap.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/95250421967.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/72780146928.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/78997467007.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/jipotewefolowodanegag.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210906_132708.pdfPDF link annotation
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/gomapujetebuk.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/af8c107b8c24b19900821d76d60ae028/39219495558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+connect+to+any+wifi+on+android+without+passwordPDF 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_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 10960 bytes
SHA-256: 227bc018f1917441cd47d3362d6f1d9b72abcec2db396c01b70b6b92bba330b4
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 17448 bytes
SHA-256: 55eb00de4f6dc2c867022c16e03c67381a7ceea752728283a603ac75e6cf2e04
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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