Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eeee8ec2d3704d…

MALICIOUS

PDF

67.4 KB Created: 2021-09-24 20:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2cb2f2040235e7b78f12b991220eb2c2 SHA-1: 5040b295e04a9f3cd347639015cdba8547c0cebf SHA-256: f4eeee8ec2d3704d24bfe332a54c8ae4c8e1d58e5a0d6f108fc1bb8f876c52d9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a redirection chain designed to deliver further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lead the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://52fotki.ru/ckfinder/userfiles/files/dixajukudolup.pdf In PDF document text
    • http://sushikyototogo.com/uploads/files/5189874693.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/99348114008.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906035012742.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5123dae4c---gafadojapatajusuxoxez.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/25187816561.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/dolonubowemagaziduduwag.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/25562061408.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/21272477140.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/jelobinisukofasonodawa.pdfIn PDF document text
    • https://armenia4d.com/contents/files/93087231901.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/zozajavosasuresera.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/jivonemelifisu.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/miwufulutimemutuwosorexiw.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613219642d6db---tagavutu.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16304587702100.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4bc0cb0071587fe2514a96f1e2181756/guwawejixarafeno.pdfIn PDF document text
    • http://cutskytools.com/d/files/55319392599.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/kikowasidose.pdfIn PDF document text
    • http://esteel.my/userfiles/file/susedowidobudomejarepo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9b27363e---4760615951.pdfIn PDF document text
    • https://nexapos.com/upload/files/ripobo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/12774283153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=alive+2020+full+moviePDF 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_off0000aecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECF 10132 bytes
SHA-256: 941f0896de40d6267edf8af9050aef03804ec545bc1ba761fd0bb551a6b9fa33
font_01_sfnt_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 14144 bytes
SHA-256: 5bbc49b4d7a2cc40d8271778a68eeade5cad8328271337c3bfb25ce4668ffaae

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