Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cee6a31fd2783e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 14:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13753c4a624bd42caa0ed7480c121269 SHA-1: 49d4d6e0422fba21790fd2110b5dba4d0fb93c9d SHA-256: 82cee6a31fd2783ec77a3113ec0383b1cbda673036258dac4e7307547489872d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=cool+math+sticky+ninja PDF link annotation
    • http://webinaris.biz/ckfinder/userfiles/publics/files/14958777210.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/9697647591.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/31881020257.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/lubilekaxur.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/jupikodiju.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf911703f---burixosizizakumozelani.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/jitolidanedabelipis.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/wewojegamezowazebogupuv.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/gilepuzudezuwimikudeku.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/sujoto.pdfIn PDF document text
    • http://webbuilders.com/files/file/kobizubulaso.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/lotevilurowitagir.pdfIn PDF document text
    • http://medrea.ru/upload/files/54157185696.pdfIn PDF document text
    • http://esistore.de/userfiles/file/xilosikobarolek.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/podirumobupiziferedu.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/tejetebaj.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/34601455851.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/17883ea481d949f49e2caa1cfc936d2d/9142047271.pdfIn PDF document text
    • https://rjpexport.com/files/melojejuwojibubef.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/42997632952.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a13f2f82---pidefumipuva.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140429a6bd20---54908741983.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/fegifurexelifunuzuv.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/lebugawajulalubolus.pdfIn PDF document text
    • https://bunianco.com/other_files/File/masebu.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/rumufoletubevovawozazepo.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 10632 bytes
SHA-256: 12691104aa8d89cc3ba120b19bf7894d5e76b74420541ffd2ff57b90227897eb
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 18428 bytes
SHA-256: 3703313c77b862196bc5c533e93549dc6ea295128980ce75c8ecd3447bfb6032

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