Malicious PDF — malware analysis report

Static analysis result for SHA-256 78272f03a721b01e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 05:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5163bc9e7c8b0f8d7954e7f15780a114 SHA-1: d983c54d5270e146151d26516e23267dd0d05c59 SHA-256: 78272f03a721b01e47e423953e9b535f075fa3d56f8f0507e4d59923fa38973d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm on compromised CMS uploads indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=vidmate+all+version PDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133063c4b39e---82160201019.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/9121039547.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/89039809370.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/12059183041.pdfIn PDF document text
    • https://onlinendttraining.com/files/jolodapibexofedanofusosil.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/35452012291.pdfIn PDF document text
    • https://csn-alliance.com/data/files/61992649843.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161333b2e6068b---57372524058.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/feronowom.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/84252918474.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e7db7960aa9f70df9f3ebaa8c947f018/pilutujusarakafefokijase.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/juveneloniseja.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/36726244906.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/xojotesinewesixekemuw.pdfIn PDF document text
    • http://strahyi.ru/images/file/divax.pdfIn PDF document text
    • http://napiarsaigh.com/images/jewezilunilow.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/weraliroje.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/pipenemexugajifutivabuve.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/vajazezas.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/22039467242.pdfIn PDF document text
    • http://w-mill.jp/images/file/nibisiganobona.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/vazebitezaxixiwudiz.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/12233047644.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/jidupubufolavifoje.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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 18216 bytes
SHA-256: 7fc4b2b695ab10276333c07a595265091ec836c1e68b672235777aea9c7b7f3a
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 10444 bytes
SHA-256: 6a808b20fe0e71e817d8a5a22541e844e1c66be138c43027c95acbc223a0ee7b