Malicious PDF — malware analysis report

Static analysis result for SHA-256 550f33b8016ce2ed…

MALICIOUS

PDF

72.6 KB Created: 2021-07-14 01:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 531604f2d0d974e87d69b11e236b7f52 SHA-1: c51faa5e7f3b2c7c7237bc5e68c3da984c7e630a SHA-256: 550f33b8016ce2ed75355b9645d5fb4ffd49930d11892a127326e45d8ce8980f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffa442e4d---xodukokiwokibelizibiveno.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089912890a84---pogaxu.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/wejowinuzagimise.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4c863544---95255252991.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb1c420b4---gexizika.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/94177634202.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/94714823418.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608972d07e885---14730793347.pdfIn PDF document text
    • http://erex.hu/upload/file/48502698308.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/71404132762.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/73240770807.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/riduvopamatenevevuwiw.pdfIn PDF document text
    • https://peterdegendt.be/file/dejojos.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd7b69f78---wodelisudasereludax.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65fa08601---33691906523.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gr633p9cl2dculd37062db1fs7/412296099.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/4886116987.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/22936985495.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/nutugegad.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/26628847078.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/dda0e67113dd40ea301d7c793608a71a/57091937317.pdfIn PDF document text
    • https://x-software.cz/data/file/66135138081.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/85112188557.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/filipexuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=high+fidelity+full+movie+123moviesPDF 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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 16196 bytes
SHA-256: 40f1738de2a6564e3bd6a2c23b0d4956e94f6201d0b9969a950096b760f34b76
font_02_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 11052 bytes
SHA-256: bfe2c3f150c255d64e5cb11fe1b263e905283f3cd16f9ab2b8d26c5912fb9721

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