Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ce1f132b3476db…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 14:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 008967a2fda12031b7aef8fcacbdc6b7 SHA-1: f3300cae831db461d090079d8730ddf96c017ddb SHA-256: 61ce1f132b3476dbace02f42e7c5b1e624fc8c79c777bbc28445bd4c2c9aa201
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a link farm, potentially leading to malicious content, and is flagged as a phishing lure. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to a compromised site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cc6c50d8---rosije.pdf In PDF document text
    • https://detmers-kontejner.hr/files/guwoba.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912c0f6ebeb---zekimadusojoziloneximasa.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/padefanimikoru.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/groqua6v2opddqc9u0rhf6fj06/wezadokadobifo.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/siwezivikowob.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd7574b80---91700264211.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mlurpdsemvbh2520i5a92gctf3/wetiwaxuximumoweja.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/82958700736.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/bimig.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/20414631658.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1e532408b1ffa33cfe515f20b2bde8de/92339933170.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1d57bc5dc54fb1a04e99dd4ead528fe7/83572303999.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210902015209.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6269d0cf3f000d83e646c6c39cbe21a1/gusibewiraxenefefub.pdfIn PDF document text
    • http://aven.su/userfiles/file/bezizexivebofinajerufomer.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/jitoxubamajavugojud.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7745ijbo9lhc0ci0kf5p95ovp/84550299124.pdfIn PDF document text
    • http://safetypath.net/cms_images/nojefetorizil.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/63967072935.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/bezabarogajifu.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/90119440559.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acb41322c---21926959823.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160703118b414d---70420188829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=weighted+average+cost+of+capital+problems+pdfPDF 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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 11164 bytes
SHA-256: 83707d831835e3234adcdfa58e759805706f13e4d6eef0ce1a9c6e555f26fb83
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 16924 bytes
SHA-256: bca8904f657d275d1a6994bb96723bf7a4b04f354919bd8683989c8b699a95c7
font_02_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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