Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7ad4206e963309…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 11:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5677646854df2a0121b217461072dd4 SHA-1: fe710ded6c3d1fdc1b74340964338e8aae7a92ba SHA-256: be7ad4206e9633097747bd878a52197c1fab56e41890052917f6504eb681e928
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards a tactic of obscuring the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://gallery4walls.com/upload/editer/file/ledizevekobikevegeraguti.pdf In PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/vosuwibe.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/vefapupu.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/46020505606.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a671e31951b---dunobisezibepevivib.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/bevidopopaladaxanabuje.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b0ceeb060e70a0ae699e3536df56b16/lilikeveguzebujivo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/70bf350897633d95ca691ef4d81eee1c/repusafosuxudasorotusalu.pdfIn PDF document text
    • http://canvangdientu.com/images/file/78159659947.pdfIn PDF document text
    • http://toonesk.com/upload/99592493506.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c565b4e907d---52942908369.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607623bfb78d8---88784534592.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b8169ecf10e32c67b87592471fd2cdd9/78701949907.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6643d494---ladozuzofotu.pdfIn PDF document text
    • http://tfforming.ru/d/files/riwebiveno.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/kusowono.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/71040242786.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b7af6c3a4---tufavidorof.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/60224140654.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/danexadirisoweriladunifus.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sowowarexebaruxunawodol.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/59238650674.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ovhbk768iseloj74k116ksicac/29750877233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bengali+alphabet+in+english+pdfPDF 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_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 16092 bytes
SHA-256: 29fa2f2cffed8b46d59586e33217a02490ad06086291cc63fb766f7e89fc747d
font_01_sfnt_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 10752 bytes
SHA-256: 8661598ecd3433de2547bdace3f34aa458e9fc725df20f98ebcdc098995ed434
font_02_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 22328 bytes
SHA-256: 8e6dffbbb95abe788cd39d60030fa60990bceb1b46f26a7412d60ee793736502
font_03_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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