Malicious PDF — malware analysis report

Static analysis result for SHA-256 5310db13e45e6f85…

MALICIOUS

PDF

85.7 KB Created: 2021-07-09 10:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f624855854730a145d782a138a31af2f SHA-1: 84a3acc16520af6f7c18306a36ad1fbe02e1018a SHA-256: 5310db13e45e6f857d28ca805163978b2e2c564d5805109248383a2b7b98c5c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs, including one pointing to an IP address, suggest an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URI findings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/fabikutafuzon.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c80088b96f---zovusefepasus.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eeec3ab66---44759207459.pdf
    • http://amuseonline.com/absite/userfiles/file/takuzetapadodadukakil.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a218bab0914---62818832627.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/bofozutorevagifexamuzi.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/08947ce8e5f771a1dd0e8772c28d70e5/94017251340.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/iimcuu7e9m5igctoe7og9l1i33/mutosewedev.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0790d7b23---daruj.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/910eb575d39f2916f5a36930c4e561bc/tozapitew.pdf
    • https://ludifrance.fr/userfiles/file/48736916545.pdf
    • http://vogiantinhmach.com/media/ftp/file/lojawuxozowalese.pdf
    • http://chinalabware.es/d/files/40365787727.pdf
    • http://paillasse.hu/userfiles/file/gixegevifopemebebuf.pdf
    • http://vantaibactrungnam.vn/upload/files/ralirororuliviw.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/20eb4e2be78934e7293cff755eea7cc3/66711756966.pdf
    • http://wib24-admin.de/uploads/file/14626218582.pdf
    • https://gloriamus.org/Uploads/userfiles/files/56753490614.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/8535932519.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e8ucjbcd3nflhenajt1v6333i1/94022903267.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b31o55iea0e36sp4qt1447k6h4/jaxemakebelamo.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b31af1e644f2c9c58e167622c7e84bac/60529050782.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d608e9cb3b08629e376e4cb0ef8ad403/18850115027.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/42964daf0c94b92b1d74b3a5d13ddb86/norelabefepamatokili.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=self+care+assessment+occupational+therapy
    • 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_off0000eba3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 16792 bytes
font_01_sfnt_off000103ba.bin
90e3c6b5f75b15fe578ad2a4c0eeb743ad32ddb7a30c530ef098d8d050fc5366
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 11032 bytes
font_02_sfnt_off00011d3d.bin
dc8895db8893d7a2127a59e3fa38ef7b194da609d9c89eb68a1a83c80ab39604
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16880 bytes