Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5e025287ca5359…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 10:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65e4db978c897447240619fd03b859e9 SHA-1: 391bf1f3036f2efed744236733e1c25224a1dc99 SHA-256: bf5e025287ca5359cc233fad160cbeae33ae15b7e8771c8d37363e49a927e2b3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=justice+league+dark+apokolips+war+online+watch PDF link annotation
    • http://wooshin.kr/uploaded/file/1479008577613341ac4f4e2.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3c3d3429---rukenibazegugisezafasado.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700ac25696---84655875527.pdfIn PDF document text
    • http://upakuika.com/img/file/mukajone.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/445221263.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xujojovibebu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/56265584845.pdfIn PDF document text
    • https://fratellifurloni.it/file/74182577486.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/noworovefivi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///75083048977.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614154c3568ed---sunuxawidusutivokuz.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210914_0E71CFF971FF878F.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/nofodofiwuruv.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/jiwusov.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/69318167686.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc109b095---86686670210.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/dalup.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/pujaruwikopejo.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/vorokosupumamegobe.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/dujilixesirulizavagas.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/tezopanupusotokuvu.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wusokevepemedadef.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/baxogotatugera.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_off0000b500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB500 17920 bytes
SHA-256: 98a575b7e3aa9d96dbc033aada028077821b6fc8bc1767385050f7ec4f3c3192
font_01_sfnt_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 11064 bytes
SHA-256: 6037010c739ad8ca8eddf66b319c12a26fb18f27ac4c878f6a7ee2bd6f14ae65
font_02_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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