Malicious PDF — malware analysis report

Static analysis result for SHA-256 437ca644d550ad44…

MALICIOUS

PDF

91.1 KB Created: 2021-08-09 20:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9cd4bf329604a4159329417f262bbba SHA-1: a5e0964c4955ceb668d650dbae3eef1b6dc02ff2 SHA-256: 437ca644d550ad447797e5f00e5e8a7ac0b6fc98293a3d86f8f76885e91b1f71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of JavaScript indicates an intent to execute code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://granitemountainranch.net/userimages/xinuzabenojizenagetivi.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086708d1b673---70412209967.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/30231294901.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a9d6a2ca17219ce84221f7c373a45e1c/ketaw.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/27525487568.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6ea50134654253fcca9176c4a5e9c2e7/wokexezadeb.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/nizekezamiwijuxozexa.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/idnbuoqdnk1s5h13khft10sntp/40465884870.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/18422695816.pdfIn PDF document text
    • http://hzqzg.com/d/files/tuxokun.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/vonav.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/abad3b019cf816de9387f1c7afe2c33c/ketol.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f36ff07a5---20247406837.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/jenigujetolu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cd1fd98c6089f3f45e60b2d135351527/domewaganazitujafotirigo.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/juwexalolowu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/23949613911.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vafobuxulovijomujokadu.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kigopuxa.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/25048313883.pdfIn PDF document text
    • http://banquat.com/userfiles/files/1043202372.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8640b311e---rozasafef.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/48384012670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=descargar+musica+mp3+farruko+cositas+que+haciamosPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 16340 bytes
SHA-256: 6e4d22a3d6d0933b5a539d8a1c3d1b5047abfeab5fc7b59fdce65903d03d4d17
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 11288 bytes
SHA-256: c773b144336a1c2397b5c5c2c23ffa4c2b7378788a5e88868cc5b2746e5a3bb2
font_02_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 19040 bytes
SHA-256: 45b970ccd8640fc30740ddff0b11da0fd21eae05caf72ddc61af776992741221
font_03_sfnt_off000143c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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