Malicious PDF — malware analysis report

Static analysis result for SHA-256 5423d9f84fa6198e…

MALICIOUS

PDF

92.7 KB Created: 2021-08-02 10:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9608457f0aee6f286c76ee233bce109 SHA-1: 08a35c260835bf38c0e3ee4eec28843f0b9aa3df SHA-256: 5423d9f84fa6198e67a1b4e92c4613098dadc0fb4081b608e225167a807ff063
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a broad attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://doo-san.com/userfiles/file/20210518172948.pdf In PDF document text
    • http://quick-thailand.com/images/uploads/file/zuduvetusiman.pdfIn PDF document text
    • http://erex.hu/upload/file/93491969133.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e7dd72a1eaf61c81c786b3adaf031adc/xufeziwaguda.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bikajaz.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/gazamizakidijimege.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b16b157790b1b5ab4c953c4403269bd7/lezabomidilitixuv.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/nugikixotux.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/20559277024.pdfIn PDF document text
    • http://palami.by/images/file/tesurikaxokelamil.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/kusegi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b38b5c8e9---73572620650.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/rewataluxujutikeja.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gmo5g9hcsn3tqa5vlbca2e4ks5/tejilona.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef80bee38---17252978177.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/94571147656.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/71967716607.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/tejixexexike.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/gapawoxunibitixusukat.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/1716929555.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/8c4a2fb6318e36fc475a65ec69ba908d/48139573898.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce77ed6124---nilizirarodemizinif.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/44654839914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ciencias+sociales+7+pdf+colombiaPDF 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_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C90 10804 bytes
SHA-256: ff11d26ee20de44f5f358ebb3ecd49df4f8ca76df8c3d348b749175d0c281978
font_02_sfnt_off0001353f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353F 18380 bytes
SHA-256: 173bcce3933d27a9178290266c6461a4d3a58a16d14d1265370c4c89e1e79ce2

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