Malicious PDF — malware analysis report

Static analysis result for SHA-256 d307e0d5a90f09eb…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 18:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a5f17f56c4f657f636e0093d16faa65 SHA-1: a077079b535c2d92b403ce1262ccc9a0ca2527b2 SHA-256: d307e0d5a90f09ebe1443c1159a2b9fa5ac8995c4f052326dd88773e710693ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ladangmimpi2.com/contents/files/nosijelupazelapo.pdf In PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/gipirelirirug.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/lunadixomoku.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/bemot.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/mesikebabesoxiz.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/41153616695.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/37554582795.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911104805281018.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/gizalonujiguwebemesub.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/vadabilubiboruxuro.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef7497728---44855435764.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/19930347676.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/zusolezipigenonup.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354811a3fb---94090117728.pdfIn PDF document text
    • https://conrays.ru/f/data/deturakifasudiw.pdfIn PDF document text
    • http://bubb.cn/up_file/file/21688980186.pdfIn PDF document text
    • https://senfina.top/uploads/files/62400818075.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d740e0305---56814827740.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/laxunijobevojesapego.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/gafonitivimizuwoguloxi.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/82137118340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convert+the+binary+number+11011+to+hexadecimalPDF 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_off0000b871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 17368 bytes
SHA-256: d617c574e3c3e9a8cf3f298d923ee6e83731cc6f356d46fa8795b943acabef9b
font_02_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 11196 bytes
SHA-256: 66d2e25b5a4a3ad9e82820d31dfa213b7e7d4080cf5a4db35bce9edbb6da8d94