Malicious PDF — malware analysis report

Static analysis result for SHA-256 c877003d28ea0b20…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 01:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcbf753ef48110472e7af710404caf75 SHA-1: a740f38ecbbe79205ff04ed76181cdacedde7ca4 SHA-256: c877003d28ea0b2093925419ef1693aa201ff3a94b0538a04467969ae2dcbb59
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The document's primary lure is to trick users into installing browser updates or extensions, a common method for delivering malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://templeton.sk/userfiles/file/fasofe.pdf In PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/nidiwatez.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/51341398280.pdfIn PDF document text
    • https://krossi.ru/images/content/files/bajusepifagiva.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/69288447815.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55a604f4e---5104299476.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/jupopewapajudowaxe.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/sirubadoremojorozi.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/9479619842.pdfIn PDF document text
    • http://schokobrunnen.com/idata/93238390704.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/48133111153.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/45535446436.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/rowarigokugabe.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210909190320174.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/sufamoviramepebiwi.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/gowakufipujojejonitak.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130816398897---45704272740.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210907173438.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/rugutites.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/98472857097.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/rikalufovobegejigowiwafib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1ead9966---vufax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chrome+update+play+storePDF 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_off0000c742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 10708 bytes
SHA-256: 9283690951d4e88c9e00bc6097102a94de4d5d9e5bf1893f2a581254fd2bd4a2
font_02_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 17508 bytes
SHA-256: 0698b552daeb50d22973114f45a7b3f6c6451cbca7c1bda6ff091c972a61090b

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