Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8928c670e351410…

MALICIOUS

PDF

72.8 KB Created: 2021-08-23 11:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0d8ad52bce86a5e5b977c0de132e24b SHA-1: e267456e1860f3378efc594aa4308940689027c1 SHA-256: f8928c670e351410cfa7806c56ad25933db83a6b3fcf015321b24fc02607a6c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm hosted on compromised WordPress sites. The embedded URLs point to various PDF files on these compromised domains, suggesting an attempt to redirect users to malicious content, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable.

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 http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbf23fa2a---bowidilazipitopovamerok.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d61f3e7f0---samavajagomofopafenuzexe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd3fec088---19514988766.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bpio91d55qorpea34rs2umqebg/nalemudukopaba.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062502520573499.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/659r8vo6gfk8t8lv7glvbjo9tb/vipizabizexudunamaruzofil.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/kejovopemotirazopasojonew.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/rugakogob.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/libagimavabige.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607035c6966a6---jidarigiruvububozobo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/61501222762.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7njsqu19f3r8g6ut6dt5pll4e7/17867019895.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e78ce8e5b---musulokit.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0qlf7m0t8f6mai7grtn63r557a/41137456041.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160710f86b4311---wumepopowadogenuz.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a4041e1f---44047951576.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/76402080662.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/jibepabuburemerozorided.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/67111238580.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/3091450331.pdfIn PDF document text
    • http://faradbox.pl/files/file/84305874565.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/pazaloxixuwiloralo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=toy+chica+and+foxyPDF 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_off0000bd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD25 16212 bytes
SHA-256: 4c4751b90b630404bb2b31bbbbaa791608231b34a049abdb4e6a29517e0b828d
font_01_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10208 bytes
SHA-256: 6ca7e6cb86a16584515a87f479418f2eb9916c5ad20f4f85bdcf53c92a0155d7

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