Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf1fcee1687f35f…

MALICIOUS

PDF

89.1 KB Created: 2021-09-17 12:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 780fd7c16108b5597fd6462eb0e39140 SHA-1: 06980f2db1dabb34f30ce34a94b0076fe1d2afc4 SHA-256: bdf1fcee1687f35f180131aa2768b103529018cdf23ad1ea0cf3f47cdf66c209
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous external URIs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters indicates an attempt at SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=mobile+legends+bp+hack+2020 PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a61521f2e92487852e8d2fcf18a4ca00/32824316823.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8286eb9be---lotupuloluwuzo.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210904_CDBBB606B5A3DEC5.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109120731268411.pdfIn PDF document text
    • http://axwelindia.com/uploads/kunuzojewopokevu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcd553f18---nunujatox.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/47637851721.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/wujavi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4268a98c16586df1ecc628eacc7afcc2/wifutidazetenafuto.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/vedexovexitijozibutipidaf.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/8564514049.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/giwitadajururudix.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbd716ca9---nixakuzoradotebetuteda.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406504665c6---musabifadumepuronoj.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///97167302933.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/zoburarufa.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/duwalikofop.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5131183f6---dijamisakisusexelavugud.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/sukiweniwe.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/21053856153.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/mirugip.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/es5nilgfapbaqaeag6jp4kfdqe/97470364384.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/levezupipij.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/20797512085.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/14070465096.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_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 18440 bytes
SHA-256: 4b2fbb50c90418f300dbebdf74387a6cb615ddb79356dcbd5a1ac1ddc7efd20d
font_01_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 11060 bytes
SHA-256: cd7ce2e25236b96b217255a10c750d213d82f369c58cf924817565b1c867ad5e
font_02_sfnt_off00013f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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