Malicious PDF — malware analysis report

Static analysis result for SHA-256 b197824d62cc7c30…

MALICIOUS

PDF

91.6 KB Created: 2021-09-18 22:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8742bc2924c0d8317aefeacc5fc76bbc SHA-1: 7d7931786169df92fbb5bb75b01258393b6765e0 SHA-256: b197824d62cc7c3065acd3074f0b2779c099ae131c62d27fdcfb1d16421bf404
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mfcpavpos.ru/file/52944472536.pdf In PDF document text
    • http://joyear.com/ckfinder/userfiles/files/ranabo.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/sakadufuwamakabubetelop.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/vijemevarudoximojoped.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/tubikanobofozibiromutuwu.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vupotemaf.pdfIn PDF document text
    • http://le383.com/uploads/files/xofudamomalapa.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/47011988241.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kilusaxeze.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/69819188062.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/loviramujobivo.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/bepegufazotowovipat.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/rslhntbvgkbkjcq69suupcquh7/monejibusefasefepilopoza.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f71d3dbaa---51553612252.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/35997432816.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/jalisaladoxilewazugi.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/d4g4leulgmnbd4dfamcl13uj2k/88010900722.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/28640856359.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/73210246607.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/wofizalosuwidarajet.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20814910723.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/27545201939.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/12040307507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+movies+fmoviesPDF 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_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 10008 bytes
SHA-256: 54e040c8d66b746159b1f7738e50c202cfc9479316f6c63c46451142441317bb
font_01_sfnt_off00011bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 17228 bytes
SHA-256: 0ec382ab55397aa655907ead68490068081627f09b3a60e7e5841e90d5c60713
font_02_sfnt_off000148a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1