Malicious PDF — malware analysis report

Static analysis result for SHA-256 9762df0b203ad5b2…

MALICIOUS

PDF

89.7 KB Created: 2021-07-03 19:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 532c1bf85afed63ac05717e6882d1c85 SHA-1: 6b8e63de6688ff96c6f84d1035f6d8a8c02800d9 SHA-256: 9762df0b203ad5b2865047a8713120f7984edd979c2f5b335d9d065b827d017b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users to these external sites.

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://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/5151233949fa0c4e952af307d03f11c4/70174028371.pdf In PDF document text
    • https://go2germany.ru/files/file/30719785906.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/13410778034.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/16469544253.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a83e1091---25735326897.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/60344202434.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d95c69912---70476330264.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/bobumilejibejibotijixipi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1e71e4740a9ad0d83fa9d7cdc823c8ab/66229418760.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/pajirudevuxesu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210628_011551.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/rimijivali.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dab0e376a6---wipazotitalesosenab.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/xakadededavinimat.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kuzasafupute.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d30ed858c---33732566799.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/40027951301.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/bc1f4963c38670623762140eeb58258e/28232817672.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fafd69f37d91e97094ddc7d6cad5df4d/sanaxojevunabadojup.pdfIn PDF document text
    • http://texmet.pl/userimages/file/77989331225.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3978466706---lebixiwovagebekub.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n38b4uu7k1u67gpcsdmg5lckhg/vuxazudadekamol.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160846f2e39ad7---feramujivirepofurudeteman.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6dbe558ac372ff8009ad83c3e3753a9f/gudiripono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=commercial+propagation+of+guavaPDF 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_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 10852 bytes
SHA-256: 8a882eadcfcc4426917d62eed6b3ca9f8396f60cd15e28124e193fb54a1ca95d
font_01_sfnt_off000114a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 17208 bytes
SHA-256: 18d519451845f65b7502e44b9d47536c014e030b32b6d1b279032ae8bc606283
font_02_sfnt_off000141b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1