Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97ad4fbf53e13d8…

MALICIOUS

PDF

92.6 KB Created: 2021-08-31 13:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 411ab3a31879d70dcca3f955314291b1 SHA-1: 50b7b9b06b0a4981e4e76504ec2fd428a03a14c4 SHA-256: d97ad4fbf53e13d8281671d17a7e0827d278bfe4b36f6f1b99d3987f3a6f0433
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tndgdemo2.com/ckfinder/userfiles/files/96151895564.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/rovape.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6frjqbj29h7l4tnp9keqhoug40/pilifupol.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076695b5d18c---topudulewolopolopavetaj.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf89a7eabc8---dosalesatapube.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d6a5f2607be1c5750083c6ed2beed841/19471632165.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p1ed5vf3u9m1cuqkc9affah1g6/74144789800.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/32e3fbf463ebcb215a2b1e9feddea968/zexeke.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/mesawigopujavebokazumoto.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zubumironefekokozu.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/mexibiwotezudodi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d13e21779d45cb8a371667cdbfd72436/87058121063.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/8196445544.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/xepoba.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/94e146de6cefe26b7ac379406a322102/73935085378.pdfIn PDF document text
    • https://faceless.me/userfiles/files/kipisojolenafuw.pdfIn PDF document text
    • https://electroagro.es/pub/files/xikugewedumajabagudewubo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608833a10b5fe---gobedixemafopimusat.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210603/file/12372931488.pdfIn PDF document text
    • http://gibisch.com/files/files/gafokukobamulowekadu.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/10393371268.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/nidewopowolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=easy+music+theory+worksheets+freePDF 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_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 18528 bytes
SHA-256: 52cede7436873e8c88e5ec7277d01d4f73d370d2411631d33d04567e40ae883c
font_01_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 10828 bytes
SHA-256: 399748786a1b2bbef78bc225f3b07331674add96dc8d055db91d674081503b1d
font_02_sfnt_off00014cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1