Malicious PDF — malware analysis report

Static analysis result for SHA-256 10145c42430bb4d7…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 04:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b77b5c70389b8091a681c5091c6984a7 SHA-1: 44f32282d95bd272631a21e902586c0efd44a395 SHA-256: 10145c42430bb4d7923e722eba72f4a725b42a6baeb3bdb40bb76804966b224a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, directing users to potentially compromised or disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to external malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://salonorganica.ru/upload/files/43221254169.pdf In PDF document text
    • http://hlqh.net/userfiles/file/20210905055404_1189829403.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/wusipox.pdfIn PDF document text
    • https://heureka-cz.eu/files/divul.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/furamiru.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/lezagawotelukito.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/dejeku.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/95347043744.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///nolarabipojibikemo.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/wiboxuwipinuneditexakuze.pdfIn PDF document text
    • http://unsersohn.ch/images/file/85918699541.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133005d96c9a---24850215698.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/87528746528.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/91269251007.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/larudipiragaxumogotu.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/texujisuvit.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/66359992933.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613432f3310da---dofodigapotalerisixipas.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/45848481614.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/89335238476.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b655fa1b88ed509b94e7edc69ed4dc22/51939563416.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lanizemu.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizikudipubovodorovut.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210916113522.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/fodagofadevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=shin+godzilla+123moviesPDF 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_off0000b822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 16972 bytes
SHA-256: 6beafef63c6776c057834bb4aa47960be11c6f0630eca626bdb0b9eae5161f71
font_01_sfnt_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 11040 bytes
SHA-256: 035f577800005c7958542165dbfa887ed37411568f14156c85d828ab2ecd6a1e
font_02_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1