Malicious PDF — malware analysis report

Static analysis result for SHA-256 e361240eba00b8aa…

MALICIOUS

PDF

96.9 KB Created: 2021-07-31 04:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b87b926803684b25bd34ac6f76d43ae6 SHA-1: f518cac753eec445cad7e69342411bdcbd969947 SHA-256: e361240eba00b8aa583749f06c79e266ad63a8fdf2e628ee2255a61c68887d1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://10glazsikeyrosa.ru/file/jifubijosulufebi.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/esfjj4cemd4lkoplmcn7b26ir4/97677002925.pdf
    • http://mientaytourist.com/uploads/files/49744209159.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca15a7c3de---38980763279.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5d98j7cmmo3p6rditn4rvoi1p4/881731326.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0fb21966e---76036903059.pdf
    • https://livnica-metalurg.com/images/pages/file/72617876239.pdf
    • https://mosconi.net/userfiles/file/63728930389.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feged.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f3dd7a7a07177bc287f1cdc12c3bcbc0/17387018320.pdf
    • http://omgmediatank.com/userfiles/files/60647556076.pdf
    • https://bcbc3399.com/upload/files/16999586871.pdf
    • http://myshopekerala.com/userfiles/file/wujemobaguxomu.pdf
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/nivexuveta.pdf
    • https://rockyhotelsgroup.com/uploaded/files/63764882297.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/brh297qpe9tv25211jrotpdfh7/lugibaxemozagawumap.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c68ccb86e---judakiriwofisedul.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160be5bbb28513---kotemiduneviketameja.pdf
    • https://247christianity.org/fckeditor/userfiles/file/wowipejugumewiziwome1623379047.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16081f23d7cefb---18550233387.pdf
    • http://macphersonproperties.com/clients/876251/File/fegitisi.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nfeqkdj3doheh8frjcv842t7ps/81246962248.pdf
    • https://tiemhoamo.com/data/dulieu/files/8504025960.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sql+server+interview+questions+and+answers+for+10+years+experience+pdf
    • 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_off000112c0.bin
fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 17792 bytes
font_01_sfnt_off0001416c.bin
09c3bb0633c5db3fc17e1dd4c7e216139b79c9b08feaaf6c095f3fa458fe66f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1416C 11476 bytes
font_02_sfnt_off00015c9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9C 16792 bytes