Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba2054bbda6bb9a…

MALICIOUS

PDF

95.1 KB Created: 2021-07-31 00:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fe7c950bd89d068da2d9f5f9189830cc SHA-1: 237b26aa4e8a47a959765873fb5f9b95fdec9135 SHA-256: dba2054bbda6bb9a6c84af9db19f06317b144df82d795b7d15d2942fecdeb45c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=dot+net+tricks+mvc+interview+questions+and+answers+pdf PDF link annotation
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/866a4bc6521f72e95c9dac379bc28007/dojewuwefopenedagigusexe.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/rozubulupesijubuwe.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960a634d2f3---162074704.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fed39e96a6c---23671610933.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/24044369824.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/95331102023.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210526_181750.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/94403108881.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2ab3fa03d4b4d1c89d241abdb270e7fb/18414490615.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9d7ed2ecac2cdd36a3c6e64570a6f16e/damovi.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/89522339375.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd7f9b18e---46734096884.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/12727807423.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/69444325597.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3071e8918---fupalogorezofufenot.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbuljit89cuveid9k1t9plduda/27143045418.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/gunedusojufiv.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/2427646240.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/91040774146.pdfIn PDF document text
    • https://equalland.com/uploads/File/88733007318.pdfIn PDF document text
    • http://btfa.tw/upload/files/jafumopexasutamuwudisa.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/24810683839.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210715224921.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/44377820008.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_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 11224 bytes
SHA-256: dea85f92410e25112472c1ea10b5d1e5aa569097eeaec09dead4f08cab1f167f
font_01_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 18280 bytes
SHA-256: e5b8b45c6754a2acfd4277dd21a8487b120e83eac78356cd91d82d9a3f786402
font_02_sfnt_off000154dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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