Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa493164547deb5d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 21:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b287e6f50a90da414d0113fa3731e6c SHA-1: aa40961633b99be179dd97f23b1a547e0592f4d3 SHA-256: aa493164547deb5d5bf7cb535fe61546677220335b074f314f4bc210dfc70aef
196 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic. The presence of numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggests an attempt to redirect the user to malicious sites. While no scripts were directly extracted, the PDF structure and external links indicate a social engineering attack aiming to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://philabc.ru/uplcv?utm_term=ps4+ip+sniffer+android PDF link annotation
    • http://ahkjt.com/upfile/file/50953691164.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e243a045b0c062608141826adc585732/10472729994.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/wudexeziku.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161401d7f1fa0a---5348141845.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/vejufunuralapoluli.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/wuxene.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/lulokaduvuzodekupetop.pdfIn PDF document text
    • http://calisnt.com/uploads/files/ludofobosasitujixev.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/wopaliratijupupa.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/82048321016.pdfIn PDF document text
    • https://vendax.ro/files/file/lalimamalikajubep.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/m09pi3dpuo58tpe8kjq2qboea2/pinupako.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/19d52c8b0060bb37de124a1c4f6370eb.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/63249267035.pdfIn PDF document text
    • http://brukbet.com/user_images/file/6984861382.pdfIn PDF document text
    • http://parfumland.sk/upl/43533709995.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/34184080104.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/vovepufera.pdfIn PDF document text
    • https://panama4d.com/contents/files/55612761861.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/29610792675.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/soxakoxonitolizu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429064c8280---kotusurerudikajufob.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130526f92fa4---26345830220.pdfIn PDF document text
    • 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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 21152 bytes
SHA-256: 25a436e277ed260d0ab19834257f479c5a2acc38e89ec66b15448b766caf4043
font_02_sfnt_off00013798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13798 10428 bytes
SHA-256: 81e5204c66e3092d063f41e75974efd3536fe5b611f3838997b96f52e6f77fcc

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