Malicious PDF — malware analysis report

Static analysis result for SHA-256 8901774afdf2bf0d…

MALICIOUS

PDF

84.5 KB Created: 2021-07-20 06:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8161a27e1ce6b434b7f934030311e5fd SHA-1: 49ce78e6180b1382a94e64e8314c72468b72ef47 SHA-256: 8901774afdf2bf0d5700c5035d52f3dad461cae99b204323fbe29fe2e48c9b32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af824f55755---xagefexalirikerorumumuxom.pdf In PDF document text
    • https://arendic.cl/files/50492580938.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9a4d8b4c---kevuravusa.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff05ee6359---32891977156.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9d1d167c5fb088df8765cdef8059b4bc/pipigaxowo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ij0a65ea92lvifiq4it9g4joo2/50679766934.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a388f3ec8bd---zebojojelirejijuzi.pdfIn PDF document text
    • http://packamate.com/userfiles/47071122378.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd19da7384768c607ee01b2ed6ab58b5/90915410512.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/db93f51119e064535238690428f46b56/79646735785.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/1015055471.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e2b7ef43---toralogolitufosadara.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sisid.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd103a13f2---dokagovinosovavajiweres.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b60d43fd78ff780ef1cf0e47cfa104c4/nawafipepu.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/komoxisupene.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210629121052.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/42749726203.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f44afd4ca76710c1586cfceb054b6ee9/tanuxewegibu.pdfIn PDF document text
    • https://digireg.at/upload/44368843638.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/toxemadusuzenubalonema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=is+child+support+a+pre+tax+deductionPDF 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_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 10764 bytes
SHA-256: 01259d2c92ac6050bdfa1a1eb59c378c72b2f65baf20e9c870c99f6ebe6e1449
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 16736 bytes
SHA-256: 9185f1964bb9213ea6b4f71a287e2b3c51e27cd7d9fdb825c51a0a1427d493ff
font_02_sfnt_off00012cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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