Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b8dc4589d77cff…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 09:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a7b782ccc7353e1639419c1e82eb7a2 SHA-1: 78261ad622f35c7b8325c9fc57c3ddab7718dcb7 SHA-256: f5b8dc4589d77cfff5969f55e73e77ac38d4a259df09dfdaf637ee13dbdca044
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://synerhu.ru/uplcv?utm_term=plex+android+tv+app PDF link annotation
    • http://sugarfree-gelato.com/upload/file/surebojoriwenovubaru.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/tewemenepudebagebob.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109042047489871.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444d6f7066b---gisudofal.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kekufexomefipulo.pdfIn PDF document text
    • https://airxps.com/userfiles/files/45174556762.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210908194715.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909135601.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/51357512184.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/44344770791.pdfIn PDF document text
    • https://digireg.org/upload/jeluzikobevimuxa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613243d84a298---letawepigixibigularevero.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/toloxelajatuzufe.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/verixubeveri.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/rafof.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/11612199047.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/82733713636.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///64814952852.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/wimotixizinufefuz.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/886e2dd4b4a4c1d90b55768bf683c345/sotisiwisewebufa.pdfIn PDF document text
    • http://xycrusher.com/d/files/tevafazade.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/98604338510.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f4235949f---gemodowijevisejowawe.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/juzobopoxixamizalito.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/rerarola.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_off0000c5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 10384 bytes
SHA-256: cab96e1a2f2275e72bbd218ed07dba20e3b4c269797c650f2de89ad855c3db12
font_01_sfnt_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 16308 bytes
SHA-256: e3fc16b777cdf9a056b10eae16e643ff7f24a3b7b0a702d33a9fa655b37f69f7

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