Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd8db301df445b2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 05:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bd8d0cccf59f60d18c9abfb03858bc6 SHA-1: 8ce2107ae2e336b9e47987b57c8f673359e71b6d SHA-256: bbd8db301df445b2419c77cd8450b3d356c690b0ade7bf460154425633ebf2fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fertilityupdates.com/userfiles/files/6560290127.pdf In PDF document text
    • http://wsp.pl/userfiles/file/dimapobaxozejino.pdfIn PDF document text
    • http://ilovestory.com/upload/file/gimugifulimewi.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/11179327897.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/63324464140.pdfIn PDF document text
    • http://theponghop.com/upload/files/30715144770.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/lidimapugunagiresezele.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301cc812c8e---34144892161.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353beac52c9---39912941942.pdfIn PDF document text
    • https://kratky.eu/files/file/mimirepoguzog.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/vodumam.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/49948600022.pdfIn PDF document text
    • http://abwessex.com/uploads/files/65187338908.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138365d746bb---91614921794.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/16898237628.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/xajuxulovugot.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/xajurolebep.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/66599136673.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/22253484250.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/44278834387.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/fojidomukurev.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/xoxotitu.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/13961743684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hack+404+apkPDF 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_off0000b93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93A 9788 bytes
SHA-256: a190ac75330a7c07e5ee7b3fa466665dc51b612a55ec97181003e84ada0dfc6b
font_01_sfnt_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 18432 bytes
SHA-256: f707492ed531f4bda715eea87f6c7394ba306867a9721fab38b898ebb687a23d