Malicious PDF — malware analysis report

Static analysis result for SHA-256 685c1a6ac42f55bf…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 18:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 016cd279b2f5bff5082c0967fef179d8 SHA-1: 0428d5de2f62f5bdb502dbd8b7ca121a4abd8095 SHA-256: 685c1a6ac42f55bf5b4b01368fab79e6a8b6d95bd5035aed7c7f5ea042b8e4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It functions as a link farm, containing numerous embedded URLs that point to external PDF files hosted on various domains. The presence of these links suggests an effort to distribute malicious content or redirect users to phishing sites, aligning with T1566.001 (Spearphishing Attachment) if delivered via email. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://service-panev.com/userfiles/62641056167.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kh2c8apbjkp7khracgngmfmle6/sewimikazuvo.pdfIn PDF document text
    • https://biocoils.com/img/file/7613809804.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/sebijazaneboxa.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/71414822868.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210909225628.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/50541963096.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/wixajoduleko.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/a335179197ba19403c612c0c10c480f8/91459472946.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/xebobajukutiwus.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/xitudesaledok.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/xipenokupafepikom.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/lupezawep.pdfIn PDF document text
    • http://agilesolutions.in/uploads/88423466393.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-08-10-37-32-z33T6mnV.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/lavilamokezufasotoxesejun.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/33282416403.pdfIn PDF document text
    • https://icbacademy.com/upload/files/sofetagaxexisaxidapaz.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/misuzu.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/laruxekujepewepixewap.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/18980378697.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/gemegidixage.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6c105fc7bec6b90869da94b131d84bf6/85023123676.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/38922728011.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wowezeluj.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613082985b244---35144537662.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/simadetulogelevul.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138832c3c501---lezaxalin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gre+official+guide+2021+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_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 17548 bytes
SHA-256: 8be84746c251f6c824aff719e4bb63ff3243e13659e08261b6f24122ca11b547
font_02_sfnt_off00012f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 10860 bytes
SHA-256: 5365f6dcce60dd5c2f45de5831c6fe3882dc6a8f2337a46fdf97ce8647a8aa9d

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