Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b9f1dc631ccfcf…

MALICIOUS

PDF

76.4 KB Created: 2021-05-29 14:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25586857f7bf1b2e7baab31da4f44c3e SHA-1: 79ba686ef007b48807e1dabc8919e4308c6bd78e SHA-256: 51b9f1dc631ccfcf43dc4a2a1f425b378a116e9ca9c67b9f73fb3bc50553ea64
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The document body, though heavily obfuscated, contains references to downloading applications, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6893f29c07---5196935552.pdf
    • http://abnicum.com/files/file/xivumeg.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ogtsqoqfsr9v5fvdjour4aqvv7/kusokoxirazovefawog.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/fd3261493d9d8afb37ad65badf8f43cc/36012426540.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7b6439b79ec8b7cfcdaf19ec42ba8d63/kevufatovokigewe.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4bab42b8---rosijotevara.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fb344d30ddfea583e0c2498237374762/fuviwaribopinukuv.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/518737h7j4bfbd5b6rk6fj1090/6792608709.pdf
    • http://abnicum.com/files/file/mikixafexudogi.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ef3811bad6bccbf1ba4ed7faa6cb4f2c/6870520166.pdf
    • http://buildinggodskingdom.com/webcms/file/gifikezazedofezi.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5976b2ecfdde01b2972ccd674877300d/81977838887.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d363056a76---goravusoviletamojeremuvu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3020a8ea---majowedugibafufapa.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b80894187---gafosupisete.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a6b5a6fd---lumog.pdf
    • https://ottenburger.com/userfiles/file/75598201988.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+ultimate+car+driving+simulator+mod+apk+premium
    • 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://scripts.sil.org/OFL
    • 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_off0000d861.bin
bd6f63d70d33b038f6feb5db422b94f1d5ddbcb808d287419aa64496360b272f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 5608 bytes
font_01_sfnt_off0000eb81.bin
15175b43b89abd2e7fbddc9b1a39ebe56a972a207d7b272593a9f712320bd066
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 10224 bytes
font_02_sfnt_off00010edf.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 16092 bytes