Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaab658908cd133…

MALICIOUS

PDF

107.0 KB Created: 2021-07-01 15:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc06bf760c4e0e3c98cbb93d153da53a SHA-1: 38edf7a60fa7433e28e43f5fff85b49199fd309a SHA-256: 1aaab658908cd1335cb672e98886de67d1548a70380790ea915ff5df5fa60cda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, some pointing to compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself is heavily obfuscated, and while no scripts were explicitly extracted, the nature of the URLs and the detection indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://seedomoretravel.com/files/files/jakelekezebojovijudo.pdf In PDF document text
    • https://planet-for-events.de/userfiles/file/siwafozono.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed4a5194e7---42723567444.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1622989225604851732.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0f04830e0412ce30e8b8cd82ed9ab27f/milumipoguvofugutobupu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e2f77f3f---70111263235.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/a1begargs7oin833rhev0ek4gc/9884405961.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43ce08e08---sulifabalebore.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/44590142333.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/69911265250.pdfIn PDF document text
    • http://mauspro.net/upload/files/18421016287.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1jg7orcgl7f49b5g21e365g41j/kadosu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8fcc756b40b0599e4d1e1c480d9b2495/16238340556.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/nabogafalu.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/82746542338.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/28616794185.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916007b2abc---97237797924.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/31688838349.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f2a4979d---zubufamixa.pdfIn PDF document text
    • https://ivaco.it/file/minetemudedufuvuzavuzeto.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/30d8a4a057912c9646dac69884f68af8/30039386970.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1g2q4elsa7u2ocb56f175rh913/saragotefiwup.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/38rqdnnvdqa863bj4nal0jue23/favejud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=converting+molarity+to+molalityPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 19572 bytes
SHA-256: 1b4625248f20fc53e4967c23d051239f402cdbe468de3b38b9c36601ebf908c6
font_01_sfnt_off000158fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FC 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00016e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18648 10492 bytes
SHA-256: 50f53b35c2bcb943a917390d57bcb60006ffa7c7f86787dffeb8554d9fc86200

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