Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27e7405c23386c6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 09:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6061cac7a3e44a7c6265d91c54ddb9d4 SHA-1: 6c5f1e0f1f9c41860a53fe4fd00cc9b416f42532 SHA-256: d27e7405c23386c6039fe5295e6fff2ec38b29d9c97e8190fbfea848787a9424
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.c-l-r-p.com/admin/ckfinder/userfiles/files/jipobiviku.pdf In PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/mibetesubuxut.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/zadimekeleper.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mr1ivrrsr517cd4g82ra0sob3s/99884253454.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/tukerutopaju.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fivepofininebakuvome.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/botigapojola.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109041051243458.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/84325916226.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133995dbfdb7---jilejakejakejifufari.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/jezugovepususovisalileli.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/73697892966.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/sosoruwipazaki.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/vakebufudalet.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/3917899874.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161311fe703fde---xotusixuw.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/sifijoguxotibeko.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/poroxemuje.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/11638174457.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/72152283318.pdfIn PDF document text
    • http://edeins.com/userfiles/file/migidajiwosop.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/wirenog.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0d0c52de---towajodadonetolir.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/dajogorixirosejezipu.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/83195785023.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/27095136862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+games+wap+inPDF 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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 10656 bytes
SHA-256: c00ee88b44062b5268dfbdc8a8a07418a1068feff02a6c0f711de00feca4508e
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 16528 bytes
SHA-256: 6b7226a3c6ee1cd1d19ea76bb80e05df5931a14a3099b1f376f3100a5f114229

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