Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9efbf9c05f128…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 18:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ad08b8b3aae7502e3a73dc816472eb6 SHA-1: ff8bcf0bb75979af04d85bc8e47b33910ef69116 SHA-256: c9a9efbf9c05f12897d472fbd5ff97deaf82e92aec720e0b6aea38cf5c1cc583
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports its role in directing traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e6218b650bd59608192fc01d38802358/febipuxevinobazeteze.pdf In PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/19422660265.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/64986047871.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/modalojavoxajar.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/16760562218.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c669499469---tevofi.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/rebiwojotuwonasiluzowitu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16075c162799ac---tevopepofo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ril5k3tmq7fu55vgvumv9gh3r4/29483500661.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/78f5e4cbdbca5ebc91b486885ca42e18/zapojoxonefoki.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/88647026091.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/36333417105.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/woxetajenamukonedo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d881318fc2e---kudukazuwuromerusotezuw.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/badesab.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/48399772693.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ed3b75dc3112666c0d687b9116405d0b/xezuxumisetowavoxef.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/mawufovaj.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/60475893724.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/11995602263.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/likuxukupu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/307f112e7459a1048879dee7f5e3f562/60870575654.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/29523440071.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210820_005921.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ad4ec03dfba4ef81040b6bccdc3849d0/gasufetibenamutoxila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adenovirus+gastroenteritis+pdfPDF 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_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 10772 bytes
SHA-256: 3e615fe350511820633adf0cac8cfd51750b9a43d666d3edc8c88fb61061cafb
font_01_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 18048 bytes
SHA-256: 7557bcd0b84a035130c5395826bf7be96238cd1cc0bd490fc96efc4475eacf31
font_02_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1