Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d28be0181c5bcf…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 19:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90c4d03421a6c2943f56172846b14c3e SHA-1: 4decc956e0b1cfbff38db42bfd9a45b304fee1b8 SHA-256: c9d28be0181c5bcfd73ba57753c277f1eb11177a21aa67237ff18bd0d1d27777
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tangneylaw.com/admin/images/file/puvakazebiniduporumafu.pdf In PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/65823399911.pdfIn PDF document text
    • http://innotack.com/userfiles/files/nowovutimal.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/pexupuwajomef.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/86775258565.pdfPDF link annotation
    • https://tpk-m.ru/files/file/48888179013.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/17204098449.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/dapisizabewaxokuxalufa.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/49488783018.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/53663591229.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/mejakojafevudifuvukew.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/55039567688.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/pasagagete.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/438e55fa5673b86d71228d7802d3d358/63551321813.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161482fe1b0feb---popeko.pdfIn PDF document text
    • http://erex.hu/upload/file/93808941269.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/54390368065.pdfIn PDF document text
    • http://tykhchem.com/upload/files/jenozobejudak.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/fonidojosafefud.pdfIn PDF document text
    • http://cloverdiamond.com/file/55171341277.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/durotideso.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d76c07a9bba08ce3bea7e8c1796e2dda/80042146443.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/nokuritijixuraroxelulotib.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/30586570723.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a87ffce4cf95c050417add001a87c11/gurodaketixowiri.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/76013145289.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/14652887816.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/30484555295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=save+battery+power+androidPDF 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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 10652 bytes
SHA-256: 26f49c8cac7c5b8f97bcda75994b094fa88d05d54dcd5dc19a5bb73e4d5bb483
font_01_sfnt_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 16536 bytes
SHA-256: 86503ab907b199092b323e1cb430243ffb312489514698b2c3258e35e29bcf4c
font_02_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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