Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07956eb8f9dd2be…

MALICIOUS

PDF

92.5 KB Created: 2021-07-08 04:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 780da383beac7e84a1e16060cc068679 SHA-1: 0b5a5cba87160f8ad44537bb83bdf7b05accbbdf SHA-256: d07956eb8f9dd2bedec0a5e461f0910372f728e4854685cdb1ab918e021d5ba5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9rots8bthu1ntlikl13g8rev4t/kivakatudexekatew.pdf
    • http://www.aadhar-interior.com/userfiles/file/wijuvoziwes.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/dfdeb724cd43279a27e44c14f033e09c/tukawanojumanageletifaz.pdf
    • http://brilsports.ro/userfiles/file///93349030687.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670b91443e---pukafikifufu.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e1069f7e074463d74e70f17241591b8a/kotisiwotokirubarim.pdf
    • http://ecandrychow.pl/Image/files/60240266323.pdf
    • http://malbreil.com/userfiles/file/12567874598.pdf
    • http://rentbucharest.net/images/userfiles/9801284639.pdf
    • https://zapcdn.space/web/img/podborky/files/10887151173.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/7a582i3ingg5444lstv8eaa5v5/bubazawexonerajakesaf.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7il4ktco6lrfo7du0jsbb6cu61/18039726389.pdf
    • http://www.allatpatikapecs.hu/images/file/21336915734.pdf
    • https://reitinguok.lt/userfiles/file/54868483539.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pv4kjfnnsb6u7cfu3lpue5qddr/26376527409.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/fvlsslgi787t1p7k2tueqnrur5/lagedisitivilozuja.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096841894998---ramepupinad.pdf
    • http://bestpokeya.com/uploads/files/jozipe.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fbc3eb7e81rr2v8fujjt76gj48/xifasoped.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/2dced745530235bee972541926124d54/17014583105.pdf
    • http://dralituncer.net/userfiles/file/79668316044.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/h5mr23rkhj1jrdc3aa3cpsdmjg/99771084407.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wheedle+meaning+in+bengali
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 16792 bytes
font_01_sfnt_off0000faa8.bin
229f4f4e18ee57cc93e4350448cb193b6d845307c04c156037b9dee927ed9639
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 19464 bytes
font_02_sfnt_off00012afb.bin
c01686ddad545ac7ddd85d52c510e6861701a0d5a475024d849098b4cc313e6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 10340 bytes
font_03_sfnt_off000141ce.bin
e10e94db6fcf51ca752e9494c9e4072ca9940387997b0bf25e7583ee3840582d
pdf-font-stream PDF embedded font (sfnt) at offset 0x141CE 16564 bytes
font_04_sfnt_off000158df.bin
05b77960a3efdcdcc61842a5a2084032daef6a2bebb92a14178301e6ee103d9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x158DF 2088 bytes