Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba51e83b929da65b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 18:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c455b6d5a89c439a1c8e9279b1fffc36 SHA-1: 5655b89ba04c0a7bc90de739522b39c1a25f0f9b SHA-256: ba51e83b929da65b02db01410557f839cbaa0bfe341f46484b057525ea5ccc69
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=puzzle+quest+challenge+of+the+warlords+android PDF link annotation
    • http://www.rajpuc.pl/pics/file/63533553863.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16309164814064.pdfIn PDF document text
    • https://wineart.online/userfiles/file/36601952849.pdfIn PDF document text
    • https://petala.gr/userfiles/file/bopoxovijudijupewunagik.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/dowajusenukepajokeg.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/lekawetamisixaxerapite.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/tadofovatelowajigilab.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/wesizakag.pdfIn PDF document text
    • http://stroi-sistema.ru/img/bemexovizeduj.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/madeluwuzokedubofu.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/sugagijopumufi.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/4407673990.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/76862162864.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/34150219079.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530ef5c532---32604290827.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/52956143957.pdfIn PDF document text
    • http://baoveantam.info/upload/files/5355280799.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9cde80736cb9edfae9f190872674261/46022862876.pdfIn PDF document text
    • http://abworder.com/uploads/files/91053078007.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109020449148498.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/kilojawazibodotikopelipi.pdfIn PDF document text
    • https://datawire.gr/files/files/menesepikonow.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2a89ad0ccf19bffd320de3089c56b128/23358994224.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/bawetove.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/p5p2j5gdd9irujbod0oq6jf6in/josifoxegavetumibubom.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_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 18036 bytes
SHA-256: c35975266b5fead557a5fbe036a87ed5cc8f1a57cc08011dabe8a78bdf92de33
font_02_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 11148 bytes
SHA-256: 4058c0ac78e88a24fc09947561a4527edb78b8d8a73bda254c7048fbf4a4a6dd