Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4b45f40541b4ad…

MALICIOUS

PDF

68.4 KB Created: 2021-09-05 03:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40e9d3eab253ea3e5642894fb400449a SHA-1: d343433bdf64c0da6c302efd0cd27093da1cbf75 SHA-256: fd4b45f40541b4ad6fc87d67cde2c56f4a7b0708799899e6476e344a9e90ba5c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dd-eng.com/files/files/70984344805.pdf In PDF document text
    • https://chsins.tw/uploads/files/202109011649276735.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119014cc78bf---22839234534.pdfIn PDF document text
    • https://olterus.com/contents/files/93306116203.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/71264126883.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/vupesofiwosaxamido.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wofozimavadonatetiwew.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c7cab3b2f12eb91392eb6564fc3bba0f/gapirofawirifano.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/de2de88d072cecc3170753a4788a6efc/78705306226.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1b2bf6165409899796a6f217f270bfbd/belugibububawa.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/68457826542.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/fametogojowozitixogitidef.pdfIn PDF document text
    • http://jarosi.hu/files/file/40735408197.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/robubovebogopezis.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bc0a79d6009400a31acd966cabaf3c2f/83206529813.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/44646819332.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-20/20210520061434567842.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/98667853983.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad67175d6c---13851791877.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/zigegidovonuwebozesir.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a767d3b56---11987705002.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/wujoxosilobamavumitalumag.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/panimumutijitonakudoke.pdfIn PDF document text
    • http://chinalabware.ru/d/files/83297736762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=d%26d+5e+character+sheet+blank+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_off0000b4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F0 14844 bytes
SHA-256: 318fdc58022ec317a787d9a57607edc6157591c4b1a17c7a31cc1ea98e880e25
font_01_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8

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