Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e35eb8fda30c958…

MALICIOUS

PDF

105.4 KB Created: 2021-08-11 19:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d7684eafca75312b35edc7bde1a8003 SHA-1: 44836cc71d496f6250bd6136cd4abe8067bb1df3 SHA-256: 3e35eb8fda30c95835b653ecc55e9657a9b3d54cb6577726d3d0f48d408d58b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://infrive.ru/uplcv?utm_term=cu%C3%A1l+es+la+funci%C3%B3n+del+sistema+endocrino PDF link annotation
    • https://minhgianggroup.vn/upload/files/95348092399.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/s01e3nnnfairga1kppl5dh21n3/jemopowopejiwawoz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e3df9d52bd---77620311057.pdfIn PDF document text
    • https://12shio3.com/contents//files/61232089917.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073917324191---fubuladigupojetunonuv.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/77197257560.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/84067303368.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d8414c5f1---38030777042.pdfIn PDF document text
    • http://www.emailposte.com/pictures/giluzuzitoruxetanogo.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210704_C37B77B77C687E3F.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/65547317751.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/4593934192.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b0669b907ce9898e1fb0d750117d514/24607552104.pdfIn PDF document text
    • http://jonellchem.com/upload/files/43082990119.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0431cdb8d4---sopazawemisobirogax.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/rimawekewatavopodalebadub.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/64g4nansk736avo041mkagel4a/govurudubifimididofegewuw.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/jafapowutoxijamu.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/42928067830.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6c71e389eb7d0aca77e42571feb8c691/80957026006.pdfIn PDF document text
    • https://turbooto.vn/upload/files/38825366504.pdfIn PDF document text
    • https://designclarf.it/file/bikerojezikibox.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/98075630730.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3cd24779---goviwirukemamumufoxa.pdfIn PDF document text
    • 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_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C31 18432 bytes
SHA-256: 73dc718d7ea00d7127dcaa0d27e3b896fa19662dc19c28bf2e8ae013d4b2acf5
font_02_sfnt_off00017b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B45 11084 bytes
SHA-256: 72ccfd6be4599f99d3c376d8cac6d3826740545955bfa4b261f30729c7ba2bca

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