Malicious PDF — malware analysis report

Static analysis result for SHA-256 99efaa2d4ac7faf6…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 10:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0be1defd8750480bc0dac5e1d56cf4b SHA-1: c2dc7b7968bb6fd29c28abbb79167ea17ea05587 SHA-256: 99efaa2d4ac7faf6564101cf1fd66f3e8944e91f76dba6b5dbd0e09e248b8b28
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=coin+master+spin+free' in one URL indicates a potential lure for cryptocurrency-related scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f440fe394d276881db5662a23c27f334/46854275100.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a288b74e5dd---20525921256.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/43e11268d3a3a1b8cf7fc79167bf220a/jekimevenutevum.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbe398d6f---labonor.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/4af408d1bbe278eafcc66f373d5ba747/rurefejewugetovubovuteman.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce64aaa5dc---9263928793.pdf
    • http://bycongroup.com/UserFiles/file/14401944950.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/c33d880886153036b859e4e6a45a7434/2259560279.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/617uiet9b4llvfl87cnkkupb4v/43860997926.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfaa70e466---64265574882.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/21b5f42b2a503233a009496b63300746/45912051892.pdf
    • http://17njl.com/userfiles/files/84604093739.pdf
    • http://mai-colle.jp/userfiles/file/boxixewosojovav.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16093e9ed744d0---zeginalo.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091a7dc2e06e---86473460026.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddbbc49ac---27229243584.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d63313dc135---42880074345.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609f14d7639fe---tulemukawekore.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/wefigulo.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e82a394ec65e8095f5ef2783e81ef266/xezovefobaxajor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=coin+master+spin+free
    • 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_off0000fce8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 16792 bytes
font_01_sfnt_off000114fa.bin
161e496f2540800475d4b6167dbd3c9ac8fe6259465fc45fff3a63bdc7565c3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 16748 bytes
font_02_sfnt_off00014084.bin
e13a291bd9577eae6eb4be5ce429a1388ee53aab0a4e4d128de45d54aa2411c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14084 10504 bytes