Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e47f8c362c468bb…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 21:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e87526478c0958880335bf1aac274bcf SHA-1: 12ea225cef1911cde003e8bc74c343a07ae99292 SHA-256: 7e47f8c362c468bbf03cc9ee00f2c70230d828277affd62e8974b6776c0810b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/8054348590.pdf In PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/kekinatodoxabimerepoxi.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/88775559728.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909114456.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/67759836313.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/wafojav.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161364c4bea5f0---6399183835.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/kitaj.pdfIn PDF document text
    • https://tadimtursu.com/image/files/83046205718.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/pagepikikixabuwuwesega.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/xikufosatizewofoz.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/vupamiralutibi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/25803885389.pdfIn PDF document text
    • http://camonetinternational.com/files/file/23593136321.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/38268007941.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0nmb5g3fg3dufv496rrps76iok/49081457602.pdfIn PDF document text
    • http://henca.com/files/details/file/89882437206.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78de8e522---35914956436.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/51806974205.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/rolikakalubinunikufejude.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/minedukilexulod.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/tojuz.pdfIn PDF document text
    • http://caramelitos.sk/files/90457685122.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/wuxolu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/detula.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/mudugubimetuxekiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=truck+simulator+2018+europe+hackedPDF 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_off0000bd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD78 17236 bytes
SHA-256: 117f78c7f2a148a68575914943534730627e5cbac458861f017eb90f022a8ab8
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 11332 bytes
SHA-256: 8aac33bdfb89db7bd440d4d15dd4dc8638036a12a01387010ae0892904d5d0e5
font_02_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1