Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c4dbfdf3f7e3eb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 06:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: efe8389621d6e3c3746968977e29c094 SHA-1: 5f30543b341c80491386768f8093438049237648 SHA-256: b2c4dbfdf3f7e3ebb11cc3f5e32a169e69dd75fdfef8bb31d293841e3c9e39e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aqualibramontois.be/fckdownload/file/sekivimijikumolesowaja.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b5ed6ac33be090d551990d80b8d0e98d/figevewokimepitisazum.pdfIn PDF document text
    • http://e-hane.com/files/zetewanepineku.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c640d939ace---72487378556.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c470bcb6869684fc7f97bf47143c7ec4/vemuwi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85bee2203a---ladivabodevodegu.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/masigefopiwevoj.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qurrv4jq66k52qfd4pl9r2hnr6/rularetapiboxikixupudi.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/visajek.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812b4614208---56954700317.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d47ffb83e85---98400380908.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/57877239130.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/kevobodadososo.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///nuxukobobazupewezesekasu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/47a6111a104caf5ddc33c34252f5e60f/pujodibadarigumovosetib.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1031443df286220acfd6f2e27b24d6f9/vodosawotoladoganowogugu.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/9maggj6oi030pgv18m66c5v2cc/vadowi.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43502084042.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/laraxoloduzegobutixul.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4973ce8a---88805106799.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/86163306201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=waste+management+scandal+1998+case+study+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_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 11288 bytes
SHA-256: ca46de25e63aa63c1e4ed016d8e3a253ea4125a464a15799ebde39beab9af6db
font_02_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 17292 bytes
SHA-256: 0428f5eb2af079d65250c6d277e7a338cdc2b546087c6a796d908a1b830373c9

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