Malicious PDF — malware analysis report

Static analysis result for SHA-256 725153781933dc4a…

MALICIOUS

PDF

89.1 KB Created: 2021-08-14 04:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5e092539427fe71d26308913eec751b SHA-1: 41a647d0a9bd4db3e7825ebc746ca99cd10175d6 SHA-256: 725153781933dc4a00e89ebb7b2a07f89574af27190cd891f148bbb0760c2ba9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The embedded URLs and the PDF's structure suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zhuoer.ltd/userfiles/file/mofekug.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/aeb3e4583825540e48485a2a04d8a946/dusabemitizanixojagu.pdf
    • http://aktifimmo.lu/userfiles/files/35670479432.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1745d9b9352b721529648dcf694964c7/borenevefipe.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e16d9db7733---vivujaselolivuzozazagez.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f76cb8c16e83e84e60f32140f97e5524/2601928705.pdf
    • http://fitviewer.info/files/file/nozunuromixariviletumev.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b024369b3351a71cfc52b12a0c5bbff8/jedizedaxeribefoworu.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad1356a4f---semekikin.pdf
    • https://vnsteeldetailing.com/UserFiles/files/bukikofokesojorigedixavef.pdf
    • https://burlingame.com/wysiwygfiles/file/xiwikiweburi.pdf
    • http://vo23.ru/upload/file/bimejegiw.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608203ff4871f---88903650051.pdf
    • http://spalovnachemolak.sk/userfiles/file/lurorinezix.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c307b500ecc---7989330436.pdf
    • https://telewebmarketing.com/FCKeditor/file/85615525050.pdf
    • http://ithaca1961.com/clients/875375/File/jasirebidareretofugote.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909c0bc39f8---84066000313.pdf
    • https://www.tunnel.de/files/uploaded/file/68234848797.pdf
    • http://omni-links.com/images/blog//file/29784133869.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4a982d26---41477278971.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/t2e75inai8b19kare4va43sjnh/dagovujufapuxisezuwobod.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c639875465e---xixigeridisotomidob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kroger+mashed+cauliflower+nutrition
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b95d78f1b56ed26eeaf9ded2f223620a/78642232331.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_off0000f4ad.bin
64ff3843e715d5ad05a05881935ac4a4149ee6e6a64ffb6dd0f1c2d28fc7424e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 18232 bytes
font_01_sfnt_off000124d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 16792 bytes
font_02_sfnt_off00013ce7.bin
01f3200563b5d8e3d928be174e94756dd47ee407ed2d1c17c43b168bf02b3a49
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 11100 bytes