Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b675b485573f232…

MALICIOUS

PDF

78.7 KB Created: 2021-07-06 11:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2f9beaecb359764217e98add90fab68d SHA-1: da5abeeffac333d03909c33cb699776fac943c1f SHA-256: 0b675b485573f232f85b97e067651373baa590b640b87a5dbc9c141a4f41bf72
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous unknown URLs hosted on various domains further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607709ecc2edb---12670484189.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/550237c8d4a717d140b413875b6ef65d/wajejunasabi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/58dc198046ec4022bc4d7bd00b24c549/dosulopevevoped.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b2b410cd8739e1f573e71c7f519b1449/sidikamebejizewenaf.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/suxatuvame.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c98d4617---ginotedu.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/lijofibajun.pdfIn PDF document text
    • http://jarosi.hu/files/file/sarixitefaxaj.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/40802100963.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acbc941177---nibolepuw.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/fumavajarakofoduloge.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4a7d5becc---22601557571.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/89907e3f17cf035f2368d924679b3e64/1531929632.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/63546797651.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608549bfcb097---ripagoseserupefowudo.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/benijup.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/pewibitefoxozupevu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/el19i26gd2m5otkhvf7gii02uc/mawereminizesilokix.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2452ecb4f4a0549ceda157893a574fca/sisikewifufutetaxas.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1f7d3c8f---67728782806.pdfIn PDF document text
    • http://apsons.eu/files/file/jimixikidugava.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/wopibojubivogavunufajut.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e63355a2---40711190997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=little+pitchers+have+big+fearsPDF 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_off0000d168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 16792 bytes
SHA-256: f44e2bd090bb2e906d885242ad9db1e7b531a0cade2ee6e7d48ce0e50dec269c
font_01_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 10696 bytes
SHA-256: 124883444bc2b0514f5d08e792c3cb69998fae86ef36b9d85fe755ec1f17303b
font_02_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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