Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ad94ac71e7dc0d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 17:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bfe73e260828d720d8a837eda44edcc SHA-1: 9e9e49a426003b1898b6e0963d4fd34a99296ad5 SHA-256: 33ad94ac71e7dc0da62540d800a7a47c73db88ca45a587d6fa6c15a3fe0921a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The primary goal appears to be to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://op-gold.com/ck_image/files/betezepojuwefemerofa.pdf In PDF document text
    • http://ausafe.net/images/art/files/saputilumodexetigulotijo.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/dufiv.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/ravopemil.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160928a2b5368f---gatebokuxira.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b57cae9bca379e35412409defde24748/lipusesot.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624925994.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089efc8d3df9---26505341907.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2179535225.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/49760034224.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/30741357032.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af65df74aec---60379525605.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/52431036648.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/59822727574.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/57961426171.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079e33a66103---21984560827.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/maloremofawo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/76069825408.pdfIn PDF document text
    • https://avenue102.com/uploads/file/69470933766.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4defe4d65f5412d27f5c84f5af2086f/fidevasiref.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/33960024723.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902085015.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8c78db9567a3021edb4a5d6c3e51d0d5/31824734430.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895aff52d35---jexuvobedor.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f40ff4c32a---59377305793.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc32d6b44---14646846147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cs+foundation+fundamentals+of+accounting+and+auditing+pdfPDF 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_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 10996 bytes
SHA-256: 61187db5ce508d45cc7e01aa9ea17117dc5b245ffcfedf4fb67f1ddfe8c78735
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 18080 bytes
SHA-256: 6b1d64694b0addbc463863b553cd6fd0db5c3f6cea7cc6c82389d638f9f96da6
font_02_sfnt_off000119d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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