Malicious PDF — malware analysis report

Static analysis result for SHA-256 4705806c7dfbabd9…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 12:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b6c7516421e32bf2df4c1ee2a0fabb57 SHA-1: 645ac2f2832e2d630df05d1bbd184cc3ef185664 SHA-256: 4705806c7dfbabd9383376358d16d9d4d2d37fed3e3899cf12bb7684ca06ee8c
156 Risk Score

Malware Insights

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

The PDF was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The document body is unreadable binary data, offering no direct clues to its purpose beyond what the heuristics provide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958dacaac0b---36570744215.pdf In PDF document text
    • http://podiummoda.ru/userfiles/file/pidofudogazebuzu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a6b00a00---43459117451.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/jeperodoxojafa.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0dd69828---50456473530.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/37bfdf9ad820198aae25b69d07a26c04/rikurefotobakexuwisotudub.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b3fefb00---kajomivodilafizewojefof.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/lozonawakimod.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5c51k8jq2gamipmp6o2hp61hbh/sirexelataxitukosin.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/cnr2u317mg5r10cukp9u2c3gf4/relupogi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb196f7755f---vivisaw.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/92820478149.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/1962865742.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e01f02c3d---gowosanizokitakuwarezi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed3dde227---xosaneluzuri.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/30i1rrrl0skgqddl6fplh88ttd/58199275674.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/rutoluki.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab8f8b597---62706404439.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/72347878375.pdfIn PDF document text
    • https://digireg.org/upload/titez.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c7aca7a8cd047dc0be1c2746896969c7/99082948982.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/895982f7af36ec25b75118a60e6463dd/67851472443.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4207b6455---1513581766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=those+guys+have+all+the+funPDF 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_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10544 bytes
SHA-256: 492d0234320c06f16c6ea1137f2d9aaaafe87cf69d2b24d61dda5e87347d4348
font_02_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 17664 bytes
SHA-256: 9ed0b0fdd860133774bccc9c7fd6ef5b2d475920a19def91c6a0b7f66ec91381

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