Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd071cb8d76ba0b…

MALICIOUS

PDF

80.0 KB Created: 2021-07-01 00:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b33e40c4735058365be539b27050462 SHA-1: e85d7770553b0e4d121deb9e39e48bffac74437f SHA-256: 7fd071cb8d76ba0b376e3e91c9faa25955a0edb9aa23bcf151dced3f6af5d84e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e669ae275c---5722680209.pdf
    • http://fogathajtohirek.hu/fckfiles/file/runuxesotegemagukivoda.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c251b6d0f3---kasigigubekejef.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5847fb84ea3767d5d37e809a5dd04959/wotajoboragujuragijiv.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ub9779tnd88r985an95tamqobf/xelanofifem.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a408ce6705---kevuwogimidavuwirobe.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073def6027e6---zekegesotebuwam.pdf
    • https://tosto.cl/ckfinder/userfiles/files/26723099315.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/8295c617e6c5b29c3bf48d629a6ba1ad/91115008951.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/82375998451.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098018b94b8f---golududedokizijefixexoso.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d42ab4c8---27815416664.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d31f1db752043f76832ce1490f615acc/5197472656.pdf
    • http://zgkimsteszew.pl/img/upload/files/77851146005.pdf
    • http://hzjksj.com/images/upload/File/50381280067.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1e1be159---pufiwomojuxe.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/be03c1cf2a0de1b7e97fe35fb22e9323/femas.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac994f17511---vodawojibubovusetobuma.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c037d70629---wijenimukulak.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befc919f6ac---86457515180.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/zokibanutagavimumejenujal.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8ccc0d46d8fc9471d48a766fa955df06/tadomagoriwadinixuwuref.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=master+of+the+game+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d581.bin
c6feb52c25a4d5f174dfa638472be0626c8df4ee2a74bdff5af3ca4fc388165c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 10932 bytes
font_01_sfnt_off0000ee85.bin
9c8ef64c16d02b2c3d068c440e5f40f09adbb4f74369c6415d0447986bc07c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 16944 bytes
font_02_sfnt_off00011abb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 16792 bytes

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