Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff87aebbdbcb019…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 10:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 641c7248d955e80e306e05ff2100e211 SHA-1: 2348e5dc13c35da0031bce8194a18fc95ee455a3 SHA-256: 8ff87aebbdbcb019ade7444ac70d908daad170ffc2c3a8f3afdd0e682c1e2bc1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests a broad-reaching lure campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=software+testing+2nd+edition+2005+pdf PDF link annotation
    • https://www.leasing.net.in/ckfinder/userfiles/files/refefuzudukateriw.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/1406164864.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/kimupozesosavepolefarix.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/gugokuwo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bdfe997d5---13605622149.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988f9262d38---dadapoda.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ad58bdde5bd886d90637e273af340e5c/74483794621.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/58033304210.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/7904376355.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/takonumozup.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/9627a54117f76c6c435fc46f3b06d28e/95035898286.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tobijabozolil.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/jipafavijelamos.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/74382955668.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/wezenesilako.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160855af10cec5---xutenazixusoxiserozuvam.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/xafoboxesafezusi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6c22a45c9c719ec0b501377286255f2/61928788498.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/21954254079.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202108310751195409.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/40752018958.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/cpbrfh9nfjt63u6pd337dpdiae/24014368244.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f42d8e9ef---giravipowewulaxova.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/laresafesudipikefu.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_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 11164 bytes
SHA-256: 0cfc6074b7b6d0870c8d311190419820cf9b9f55d9218ba35b6b2e70d9c19fd4
font_01_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 17704 bytes
SHA-256: bc1c6cab9f2e647f6c6ab6006ab6a5c18aafbbd3d5f930525a70f6a91d7930b8

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