Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ba28f3d8bcde48…

MALICIOUS

PDF

90.0 KB Created: 2021-07-13 23:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 94020bb369d2449ea1e70c256f4e3982 SHA-1: 948f69a3da7ffb37ac258f0e2a72114309a4cdf9 SHA-256: 72ba28f3d8bcde489391befe9ef4580ad7d60c7b7b1fa9407dcee0aaa8d26840
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristics imply an attempt to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/540tt076kapdiddlae37074pj2/terenibavoru.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2ths311v01i90qqkns10a7pjt9/84319822925.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16081826185333---68964601756.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/maxadoz.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/mexevawu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4efc17566d---66854806664.pdfIn PDF document text
    • http://atrsara.ir/resource/files/digidikixewatuzes.pdfIn PDF document text
    • http://bjallstar.com/upload/file/45012125304.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072311487b8a---jepumevov.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c623227afaa---tozozukevewib.pdfIn PDF document text
    • https://magerp.org/upload/files/24434876200.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/28290994120.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/sivotadusofegapib.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983076758d2---sujitisurafe.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c60167872---11143119986.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/146437531160cf589f7b9d0.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608af1b6f1ba2---64729865717.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/ligogu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607924cd5ed79---23196611574.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/dki5e5ijovb76uutmopo6cia4e/46052256167.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3020f3a31895f17c849f591e6dea543f/76920452949.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/tomisazinabogebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=is+jersey+mike%27s+healthyPDF 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_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 10472 bytes
SHA-256: 9b186ccb8bf4ab54f66ed1f6afad5cc9a412657fbb1ace10ed8bb7fadd202f6c
font_02_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 19540 bytes
SHA-256: 1f407c90db9140230c1b9e6f2cb9fddfe8c5080e6fe0961fc380ef295945f378

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