Malicious PDF — malware analysis report

Static analysis result for SHA-256 869fd4f6642235e6…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 14:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f110af63b73093976a30bd0b699aa7d9 SHA-1: f44f84c56523156bd4d509f8203806c060b366b8 SHA-256: 869fd4f6642235e6593d23ebd7ab9067a7b8c5b4e212b5386c28930c12b7533c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to malicious content or further stages of an attack.

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://tiklatakip.com/calisma2/files/uploads/refodozukakewasofidisuv.pdf In PDF document text
    • http://zae.me/datafiles/file/dukebaba.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/lawixidazetosuligikefo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/95116787305.pdfIn PDF document text
    • https://efnnma.org/files/file/96979488079.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/31131051628.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/dugixukawijomilasip.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/72548987914.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/9261c4efa7a841cc5e0a51ece2d71bc9/13060200867.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/78305257213.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/penulatatimepake.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/rixutebagukanabidixidowur.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/80965229906.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/48214946595.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/pulimezakubobovoso.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/14517698177.pdfIn PDF document text
    • http://denledmpe.com/upload/files/xukurotevijagopikefisam.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610870b50732e---weliverelutowumewif.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acf50bdf70d---jituzojozobuwegajizerapat.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/tewekibisusetuveruw.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c357abe1---56899386501.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/lazizudaxib.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075acdde468a---24925546702.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/81362672103.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cade12acb---foviwumubexalep.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/gisogobifesof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gpsmap+276cx+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 18652 bytes
SHA-256: 8119ca0add5a47ba2f2723dc7e3da3759e1d4276ac8bac7b8eb41f22fce80021
font_01_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C1 10572 bytes
SHA-256: e4417ee2f6a649ab8c3549032442d2c17fcd7417475a610450f427c8e750ef2f

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