Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdd9f032c667778…

MALICIOUS

PDF

81.2 KB Created: 2021-08-27 02:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10b2adf217c91b8ceb909106a5315dfd SHA-1: b6e1868edda0cbdee628d0343150a823eb36b268 SHA-256: 6fdd9f032c6677787a7c0f4a5b76b027e512e6499637a2e38f90a5897527ff85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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 http://intertribo.sk/files/29048556823.pdf In PDF document text
    • http://iphysiology.ru/upload/72144354561.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af9dae6df---50866166558.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/23038098545.pdfIn PDF document text
    • http://kccmaul.com/files/files/40062793395.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f0716043---42375646094.pdfIn PDF document text
    • https://foreningenflex.se/anvandarbilder/173/files/82115025676.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/poben.pdfIn PDF document text
    • http://partnercable.hu/files/42605775518.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/42969076111.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc0f232e8---baramegorasafezibagonu.pdfIn PDF document text
    • http://ranch.pl/files/file/suzetijoli.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/40456240151.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/56607043679.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/57239149435.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d611a5b1192---nekofilupifuvuzoxikawu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07a4c86f1---nokujaxotezaxotoloro.pdfIn PDF document text
    • http://debden.org/userfiles/file/28386074196.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/29962107083.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/45746777373.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/xuguridovadokidoku.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/mebigagukaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+convert+word+to+pdf+in+office+2016PDF 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_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 16716 bytes
SHA-256: d4e2e769bfc9c5ec94a67121383cb9621218bff16a6c480752b8bd8c389a9758
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 10840 bytes
SHA-256: 01f3a296fca1b01552700db8e523e8736fb01a55b5dd9b61412e48d89d9e27dc

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