Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eec905859f0f51…

MALICIOUS

PDF

89.1 KB Created: 2021-07-01 15:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddc030dbf2e42faa263841b3282b9eb0 SHA-1: 19094dbedb1cc0f8de53dfbaf3cb7ba623772d6e SHA-256: 78eec905859f0f5162349c1245b8f70b30a1f944cc9295518a081b3abff4442c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it with high confidence. The embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/433a44531902524b167520fc3796695b/44701004334.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/896335b57c4425484a4b1f11fa19114e/nuretaxevopudunisume.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160869be735736---14725066534.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080730ecca86---gekisazoli.pdf
    • http://cfacgroup.com/uploads/FCK_files/file/21684843554.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b3eb97f52dece644742cf1cf8affeb16/561266730.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1b3a73162f5c51b86e6e8a4f3710049f/jibixologar.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/22ce0589ad144e887ba470fb1cb5e2e1/vesunodezovenexatat.pdf
    • http://chinoboxingclub.com/clients/36032/File/87096841536.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/87c94ac492584587f534ab585cfac30a/sidizalozajefubodekonon.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/711f951cbf6885d4a418386f2f859a32/lolutegesixivowuvivuwobe.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8fb79636---3685701547.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/meregujelaj.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18e2f52413---17944385773.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1d964a4ecf8ecd7bd0caf53db590e827/17012005549.pdf
    • http://onellenorzes.com/uploads/files/34009632062.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/92028ed61d5fc42eb6d15281107fe323/riwewekajogif.pdf
    • http://amoy-art.com/Upload/file/doloxetazamekegokaxopofem.pdf
    • http://chroscina.com/userfiles/file/35936693070.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/o0mf1se116vme5c2v91k8sqt80/7156023464.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6eef38a83---petubugelav.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/h4l5o8kvn3vdui2rgoe92kk9c4/47431310620.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6dac4a2dd0901315d35b7d1afaa4f1ee/13579299552.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=harry+potter+and+the+cursed+child+about
    • 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_off0000f72c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 16792 bytes
font_01_sfnt_off00010f3e.bin
04ebef61cb2fb3d28f8c115d33f1d81deaa9815b0ac7f839a7a163758e91d6f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 17964 bytes
font_02_sfnt_off00013e08.bin
a53cc3bdac48e41fe899ec741f365193b9208f743e873c9bc0ed9564e9e52f91
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E08 10956 bytes