Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f0191e657a42b9…

MALICIOUS

PDF

95.9 KB Created: 2021-09-20 05:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b69cc0f647c3e6563a6a172bc59803a8 SHA-1: ed9e1721f5381f80b48dbd078edecfc9228fa3e4 SHA-256: e0f0191e657a42b981ce529c6bf5877ece73d3441de78436de91113b67ebc825
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress uploads and disposable hosting domains, likely to serve a malicious payload. No scripts were extracted, but the PDF structure itself is used to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/14636760378.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161305c1c815c3---5920141493.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/13167983421.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/69478939117.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nudevulujuvixejaxijodewak.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/55210785333.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/sefagemonigon.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/70338243516.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/fajaxem.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kekufexomefipulo.pdfIn PDF document text
    • https://novsport.com/content/File/627208908.pdfIn PDF document text
    • http://upakuika.com/img/file/20814401876.pdfIn PDF document text
    • https://n-tlg.com/files/file/89976866885.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/vesovepowo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614038b52bd65---80181420628.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aspl40irk13ntnkevt6qf33k6c/43617223173.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/dikiwus.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/zexifexenobususu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142ad7bf3555---83631763807.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/98498162844.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210917154841_p2a5li.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/4655371011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+handmaiden+full+movie+freePDF 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_off00011504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 10484 bytes
SHA-256: e4e6890bc31f30d44ef9ce1372eea6bed4fcba3fce85096dd02647a753a0879b
font_02_sfnt_off0001449d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449D 17456 bytes
SHA-256: d8bead5e0e4980b0312396a7676f98d141bae50b67ec2599d3031b18ec9f449f

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