Malicious PDF — malware analysis report

Static analysis result for SHA-256 2001cbf1cffa71bd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 10:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49c46088b6b0c0e917f3ea39abf3e663 SHA-1: 8637c826c3de23484d9da6e272c8cd35ebbd3dd4 SHA-256: 2001cbf1cffa71bd80e379422f7aec075e8d623d457e5d5fb880cbaba29ad58a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised websites, likely to host phishing content or distribute further malware. The presence of multiple URLs hosted on potentially compromised CMS uploads suggests a coordinated effort to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/b3aee134a94c7d2114f4f3fac71bf527/2894396570.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/31eef9f411816df20847d55127ea6e05/gidowafapuje.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fc9eb2f4df2c04773ec09c1bdb329e2b/18251934555.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/89773150722.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/569434825.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/rugibowibutuxeja.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/11292401233.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/65366881969.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/zegudopufegu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f563e5895c0e0865f683318af8ecf85f/96286794722.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/27700314842.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7ae9b1d03f9b05c7a6923c1ee302f970/87405738245.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/savubedamivinukewededarul.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e58554a32---vokotekax.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0868996f1873d139d3c71428bd06008b/89048254104.pdfIn PDF document text
    • http://moneymaker-gold.de/files/sipopilavegakola.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab1be7e3f5---78487516040.pdfIn PDF document text
    • https://majubesar.info/contents//files/filuxuki.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/6f5b2714197a485598de03c4bb5cbfb5/xaxotid.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/59267265173.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210602221127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=subject+and+verb+agreement+worksheets+for+3rd+gradePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a267da36cff---56676796291.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_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 11644 bytes
SHA-256: 2ac6abc183634114563c8b0abe5bce2b8377cc5ff2646ee6b8587121cd2502d2
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 17568 bytes
SHA-256: 52aa86249bdfc0b1e41a6f01e6b9aae97d390095263961a9c36dcaa4efb000f4

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