Malicious PDF — malware analysis report

Static analysis result for SHA-256 04754162f6d7cbe6…

MALICIOUS

PDF

79.8 KB Created: 2021-08-08 03:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab35653de6674cf1d457f2ce844e0c43 SHA-1: a8a6a50efdb18af421fe7364ab3afde4435d567c SHA-256: 04754162f6d7cbe6a6cdec6d2cd5bfdf0d9d3d836a24cdbbf47a5e3352a869ee
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or tech-support scam, indicated by the 'SE_CALLBACK_LURE' heuristic and the presence of a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the document's structure and URL patterns are consistent with attempts to redirect users to malicious sites or solicit sensitive information via phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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.
  • 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://wooshin.kr/uploaded/file/63319574060dd75b8c49b3.pdf In PDF document text
    • http://marta-galan.com/files/varios/file/96012939378.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wajesiterozesaz.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/xilolum.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/65867182738.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/47680782c9183bbd9f2456d21bc1b7d6/83831287609.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/43874901563.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/tijoselaperefofemuxawa.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/26434237247.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/vufoxulusugamemapike.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/wawobaritirijumogak.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/biraxuretozax.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/59524492036.pdfIn PDF document text
    • https://altbuket.ru/files/dowixutapiru.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7900275fe67427fae67b4b6fae2849fc/46485321870.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53483d952---97200661061.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/20958718655.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1336661cec---93264093066.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/miduruxebamewevex.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1021881e33adb197f37c2096a289c3e8/fiposobibidaxa.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/7682147633.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160780e8dbcc4c---memipudedamer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=epistar+2835+led+datasheet+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_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 10988 bytes
SHA-256: 9885b2af76d724dc2c3ea22068caa1f50a63552cc94bc077a2de4ae8b8aebe11
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 18244 bytes
SHA-256: 3609c9658ecaf1a8ce1dcdb707182d9a6c417163a035336cd19e3677f60d4fec

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