Malicious PDF — malware analysis report

Static analysis result for SHA-256 15aa4f54e46ea19b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 04:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18a577518ce057b7018befa33093bcfa SHA-1: 767b80bffe4303bf6d8ed2087e30ffc61e7be53a SHA-256: 15aa4f54e46ea19bd72e306a95b67b203e56cd69c65178eb34645bc02b7839a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

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://chemonova.com/FCKeditor/file/suveropabipuwarokinere.pdf In PDF document text
    • http://sp3siemianowice.pl/userFiles/files/xovopegada.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210903015423.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/16734321736.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/67166706020.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/92326921094.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/60451655230.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/78aa0a7d1724ce2a7b4e9b9aa423f7e7/tolise.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/sokadexitajoxebomagosoguw.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/17931348801.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/10858122385.pdfIn PDF document text
    • https://onlinendttraining.net/files/37914346675.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/kafuponorefipuzojer.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/81883fed7df7802bff2c0e8f9be1eef1/8723783679.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/91529361840.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/tizife.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/52460601257.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d1d97ea8---47527169991.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210905_095710.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/38068845942.pdfIn PDF document text
    • http://rentaruedas.com/files/others/52106473364.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/76853234898.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109050709556936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=nikka+zaildar+3+full+movie+720p+downloadPDF 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_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 11236 bytes
SHA-256: 7165e1de310c70f72b1ea9e16a528e138e4688d8043399bd9c643bf2f87e9267
font_01_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 17696 bytes
SHA-256: 3f38f93e601e730563268cb5c1beaf8fad6ee217ae274401376ecdecd898d50e
font_02_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1