Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b24bca6858bb268…

MALICIOUS

PDF

83.6 KB Created: 2021-07-29 15:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d42f442e09edd66f0f45beee1c0a04f SHA-1: e2151be34f7a8c1496188b1e8437c515705a49a2 SHA-256: 4b24bca6858bb2688b1d2912abacbffd8cee9fe07467bed6057b702210ec2f80
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains. This structure strongly suggests a link farm designed to lure users to malicious content, likely phishing pages or malware downloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9c863ed06---96556473887.pdf In PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/gamaseremulu.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/ruviwitazuma.pdfIn PDF document text
    • https://ancoraeducacion.com/images/romula.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/runirukuwusawutisage.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bec05a854e8---milupodilolibazulubolovaf.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/5963811976.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5s8g4b616qiv3nqo9olnlvf1o6/vifujove.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/37623020268.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/busafefedezufotor.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db0d7455ed---98502795409.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/rojavob.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba063c15e---vubudajuvi.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/monobipovujusimidusivenav.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/51863448074.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/japokuvilavo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/bufebedixu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608082c2b713d---67226748161.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d215cc97e7---misekepuxifa.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/7028corkdrvbv57mkdhjdif4jg/34246555740.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ef8f3905557b35ba6b954f79333f2297/83300279340.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/tinisogup.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/rokifexoz.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/nabovudarekimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+verbo+to+be+pasado+simplePDF 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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 18356 bytes
SHA-256: f1ff3c2fd47a570419858c6d60dc3c03dea8e05d67e58740c36ef3b8efaa8030
font_01_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D6 10892 bytes
SHA-256: 4b6c60764ac77685430fd581c7e7683e914071b0a7712031ea05ea866b70ff39