Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf2b6819d5880b2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 11:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 663955648ba5b7c176e6e2793117fc0a SHA-1: cb5be45f51361e244b4844f0208fe3ed6a508324 SHA-256: ebf2b6819d5880b28eaa824a5b563cf3bfad117df85dfe6019d914274f30c652
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while numerous, do not form a coherent document body, reinforcing the interpretation of the file's primary purpose as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://industrialdevices.in/uploads/9775896861.pdf In PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/45203409287.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136909d6afbc---suluxonenini.pdfIn PDF document text
    • http://rafaelokazakov.com/file/26964055422.pdfIn PDF document text
    • https://shibbirs.com/media/files/48657529827.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/zigasilukubijus.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/he9ld95cjmvd4jrgj58bh1khrm/20653823450.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/tusawajedo.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/45014853181.pdfIn PDF document text
    • http://njxinbell.com/upload/files/32523023158.pdfIn PDF document text
    • http://sin-hua.org/userfiles/sisazuguboxeditolaziga.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/kofozefitubulevegidobisa.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/dizominesiwizarutomudi.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/fufosomuvalejobupur.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616e950a71---ziler.pdfIn PDF document text
    • https://pcetravel.com/files/file/16949902573.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/genigelezuvas.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/xopezumej.pdfIn PDF document text
    • http://xycrusher.com/d/files/timuzivexapetopumu.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/46011988860.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/82814941983.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/diragedajiwonovuwam.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c37151b1---lonopuzuworofakazej.pdfIn PDF document text
    • http://geasit.it/userfiles/files/nolibul.pdfIn PDF document text
    • http://onlinevay.com/upload/files/83426605045.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/36199311479.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/tabibumawavaxuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=all+the+things+you+are+pdfPDF 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_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 19132 bytes
SHA-256: e62cbfdda54c21209678729e0b8113a464206c14f589bb4e414a1f317f7fd9bf
font_01_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 10972 bytes
SHA-256: d3697c3be83a1ca546d7e3f05b5d6a284127673bfcc028db8c4c7ee8ce793edd
font_02_sfnt_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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