Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e0e146c792c975…

MALICIOUS

PDF

73.5 KB Created: 2021-10-07 03:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 131a5a724feb31feddb57923aa0ad9d8 SHA-1: 474be4f4623eac126e4c3b42c6caa32800bce54d SHA-256: b9e0e146c792c9752cc020b62c6791d9b97859485215dedfb99b78a488a5906b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Some of these URLs are hosted on compromised WordPress installations, suggesting a potential phishing or malware distribution scheme. The PDF's structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=how+to+make+your+dinos+lay+eggs+faster+ark PDF link annotation
    • https://albizy.com/ckfinder/userfiles/files/jumagamokimugubogo.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/xomulisepasuxuxakilejoja.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/nejotaga.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152cda87c500---fasanexirobugaveguno.pdfIn PDF document text
    • https://agrando.cz/files/file/41720524969.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/97114561839.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210923112516.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/80025891227.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/naxilugobolig.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631852922.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/89338699951.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/depubasataxubuxix.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6e83f8b4329b4ae1634463446e24df89/xigor.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/63552510736.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/pirunijaxavatajasaj.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/87055566250.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/93117793262.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/2902833053.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/gaxarepuvirilalirotapo.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/94549825310.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/43636057186.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd3e031b9e---82526619279.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/mazogiz.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 11080 bytes
SHA-256: 188fbeac660ec9deaeff6f0bf70e257d5e7faf163415257b756f1b1277b3c86d

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