Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec62e900b0352e38…

MALICIOUS

PDF

76.5 KB Created: 2021-09-13 11:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0b969794db1e53db42538aa1c589806 SHA-1: 0cd3db80bf299ff9eb560c9cd7faa3c40051f10c SHA-256: ec62e900b0352e38403ad61b4b8cfbfe5765b75995407f7ca8e77fe814c2e0f8
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm or redirection mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing browser-related software, a common tactic for credential harvesting or malware delivery. No scripts were extracted, but the PDF structure and heuristics strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://teplo76.ru/uploads/file/woxivibo.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135906abed5f---59370573481.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vh1sc8es73nov2o7f80lmi6kvt/53225761225.pdfIn PDF document text
    • http://leskovec.eu/files/file/binugesuvelodifapuzif.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/robiteviturasawet.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/74432756652.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vobiwujomarixemorede.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/nonedizema.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/vonutujozewelupotam.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/66872572015.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/xerekobafadifawivi.pdfIn PDF document text
    • http://secoinblock.com/upload/files/vigigofojem.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6dc86b1d---vagubaso.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/96615405531.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/49260774285.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1b06d099409415f467744353bd9f24ba/10809320618.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/mupivenefa.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/xarewivapamejawub.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/90117432840.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/xaguwo.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/wutupibovigumimibetasa.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/no8nucum32cfle0l39d52c7nj6/vinilim.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/vofakoverejelazederopubi.pdfIn PDF document text
    • https://ags-car.com/upload/files/repufogutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+app+emulator+online+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_off0000c842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC842 16908 bytes
SHA-256: 0389984eab2753dee099e323ed7648c5207eecd16ae6b21e4e63b58d780c2fac
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 10572 bytes
SHA-256: 5c7cddb3577535497c18c7f02cbcb21025a1a4ae5d51fc644b38ab044fa9557f

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