Malicious PDF — malware analysis report

Static analysis result for SHA-256 98838059e69f3467…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 12:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e1149469caa0f9b7b051a4e7659e9d1 SHA-1: d4cc17b775a0d92e41f70f7493e8dbb072856ddd SHA-256: 98838059e69f34677233b9d6fb9efb64a71f5dcf3d5f8d584750529c2813c101
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The primary function appears to be directing users to potentially harmful external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=natural+siphon+type+rain+gauge PDF link annotation
    • https://nuttydog.hu/ckfinder/userfiles/files/begurowiwekavujatetibu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397ebfc4c18---letukafodepizaxexajekixil.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/vogupomuludal.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210902122241300958.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/munapixepofukigafudep.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5fa209db75322ee0f5a521f79bb7993b/17155810903.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210908012624_512181530.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/jetirodaxisa.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03a3817e3---49878998975.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/nodunewu.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308982787768.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/gagerewij.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109110204312422523b3tr3nozda6.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/zuzumisazex.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/58029345769.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/zujujalibisa.pdfIn PDF document text
    • https://12shio4.com/contents/files/64814424084.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/88458408539.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/karebexovewawifa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5d4e2069---49517223552.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/jivijokuniseliwubipapi.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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 10720 bytes
SHA-256: e04e9713b27108580748390c8265e99b882f56b6d049249e55372eb1f8f47d75
font_01_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 17544 bytes
SHA-256: d54678e623091f3e4e4c168a736b053b7eff6c379afe9fa2b2b86e6e8c5ff6ce