Malicious PDF — malware analysis report

Static analysis result for SHA-256 27536098ab36e502…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 13:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19f1862589932b27af660dafa05a0881 SHA-1: 7b61650ba8b91eafbc683c73d14dbaa6d2d9b6dc SHA-256: 27536098ab36e5029f6f975e5089102ce5447c1b25afa1c81306f053772b674f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a link farm that leverages compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to download or redirect to a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mmszke.hu/files/file/16655090640.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2756763a66---jifanof.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/topudumaduzogesagigu.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/61607877223.pdfIn PDF document text
    • https://actorconseil.com/files/file/96320372661.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/bowogoxigusonezinimo.pdfIn PDF document text
    • https://bem-sa.com/img/file/81796201906.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608938bb78d38---vekewibupup.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/38da07a4aef0d2739d877fa668d5a9fb/22423717723.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/gibabodugiwut.pdfIn PDF document text
    • http://vswet.ru/f/9845416893.pdfIn PDF document text
    • https://fasleh.net/Files/files/21517138914.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/27590806180.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/gidafawuremumojimozo.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/15121730009.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/motetuzuvawefelutafo.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/sufibofamajozo.pdfIn PDF document text
    • https://fallsplat.se/file/xuvanega.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/30806395342.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161235c3b9c9ea---58812220653.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/95406568556.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/18564005593.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/vimutaruzafanaxaradek.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb3571d81---63802678612.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/bijevedobutipusat.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/babofejulidaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bradford+white+hot+water+heater+service+manualPDF 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_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 17944 bytes
SHA-256: ef3978ae6121506607541f9f902bdce014e5d2dce3caf332498e8ef104237c71
font_01_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 11048 bytes
SHA-256: fd3e6952b77e3ff3ee20ec0faae6949248c03bb2f194a06326ab060386fb19b1

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