Malicious PDF — malware analysis report

Static analysis result for SHA-256 414dc088d66ea1bb…

MALICIOUS

PDF

85.6 KB Created: 2021-07-29 14:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 780dfd309361db9aabd4f6e960e71e82 SHA-1: d019501544173dd8c2b293a01d15b24c9632348d SHA-256: 414dc088d66ea1bb4d57fba0f244b9fc5bd6c5071b1a453c76b8d4f46fd47cbc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised websites or potentially disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term_redirector=True' further supports a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2a22ad41f2b0ce4b2ed146f2f387206f/49452537268.pdf In PDF document text
    • http://cybernet-ap.com/UserFiles/File/56195242218.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/52bbd42f74bce8726334c8c6f963f5a6/luxirixavafipuxina.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210608_121912.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tukanobowati.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/jarizaxilofuto.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nuxarovixevimixawub.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/jijom.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e0154954---25922293416.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6bfb01fcd60eb90bab23df4a80d08fd1/22751660027.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/da08e9fd2b4a9956302a54d9cc16ee0f/26717140834.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/xutuzanalelorexifuvulurem.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ff9c5ca8bf6ff97c14fc2258cacba502/sofaxurujemi.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/gosibepowanareziso.pdfIn PDF document text
    • http://byecook.com/ckupload/files/78579767057.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/gejemosumaduxata.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/28466163802.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/4309513623.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/60010331963.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/77028424048.pdfIn PDF document text
    • http://mebco.ru/images/file/zamewosaxi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b7abed02efefa84b930adb5579a22a31/ruwekupizevavose.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9726ea641---wodutakexuz.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/tisexavodikakiduduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=le+banquier+tome+1+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_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 20536 bytes
SHA-256: 2bc691e40c1b271ba4d81e05ba8d421f733bb20bc51266b17d3a2a1a97fc3866
font_01_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC1 10840 bytes
SHA-256: f4b2312281483907cb02d94af8988741eb98d5f8f2b3dd5b6c5638b22fa4aed2

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