Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdda1ba5d2f8b585…

MALICIOUS

PDF

93.1 KB Created: 2021-09-07 22:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05d7a2bb3b171af3fab604061544408b SHA-1: 1665e202911bb1fc7da83c24eaacfac0e24a26a5 SHA-256: bdda1ba5d2f8b585f6b68b0798b1e3a907d89f96c5ce743437bcff3290da813b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The file's structure as a link farm suggests an attempt to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://munsusa.org/userfiles/file/20210519154835.pdf In PDF document text
    • https://gilboamedia.com/userfiles/file/34836318010.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/xovotewez.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/99e029b388ab3f8cbc565ff07a78fe86/82343061364.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608444c87b316---wimelanolurifofodetex.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/46626854633.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd772a4fc---pufawabe.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b4bd5b7cfe0288b05d4ee21b86bc93e7/89395326818.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b8d5a164036a6a721ee421a26e247c8b/dusugatezibadava.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e104a8153---66637411506.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c374735d0b01753b630cecca66fcd8ee/tezev.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/wiwusitotimatuv.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/11531183119.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ccf576a8f950592bd01f8567714bf91b/lafuto.pdfIn PDF document text
    • http://shih-tzu.ro/files/file/zuxunaxaratez.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0454b0c4---nezunatutopaberamafori.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6791fb0bef---jatagupelufokuzuno.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/67039083221.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/pulagafiwurete.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/40892148491.pdfIn PDF document text
    • https://wineart.online/userfiles/file/lazeborikipuforapedinupi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbda456295e63b90e3f6baaf3101c01d/81212159825.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/nebojetulew.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/wojagow.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd201f3ea3d---33045132701.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///guzonifonedalosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=moral+subjectivism+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_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 11108 bytes
SHA-256: 1852eb953fef6fbb86516a464dcd42412b45b43d1e361c217202e3b06adc2ef4
font_01_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 18044 bytes
SHA-256: 74b4c26c4adde832e595c6e9b0290a5f594fc827406f82633f996944f49a0f76
font_02_sfnt_off00014edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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