Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfd632541a31504…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 07:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d7255fe1f6eef44d8ac34645d9d46f9 SHA-1: e1b4dea3c9d3ad6f4e21d2dbb6a703b2440765cf SHA-256: 1dfd632541a3150416c4c7a8daf9bc867b1190c2bc15af79825527287c4634cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF links to multiple external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bnblspecialities.com/userfiles/files/50816314668.pdf In PDF document text
    • http://irk-yoga.ru/upload/files/demewimomiwufixekoluxad.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/k54fq3ubrlra2tp6vgf3jmgh21/zexadotaxokorevefukufijob.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/427e8f31e399a3e7346533c30dbe4c18/300111036.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620433068.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740b84dd7f9---naweralowuwikazukoruvinen.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/vokugebugudojepe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1fsdffgs9jflmm1f1h1956pn0l/81590377298.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/waxiro.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gigaxidepeduzigipasotiv.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc69ee59b8f---81929248479.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/kolula.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/dsjrkogf995q9vvmp51q3justq/zapepapufijit.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/af43e1c975ed940dfd49818ae413e3a0/madezonakofazesuvawo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c89503e16---pilenorarepinatodide.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/ba78b4818e5c55dcd0691f6692d9b968/pogonavutonulufosofoke.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c6e5b6d6---12768633600.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7413cc1cfc---12412094675.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/54382221943.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/dipipevomubuzedawijiwepig.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161052d5b691aa---xagogupugomubad.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/39890672830.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/80652974917.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/18668461185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=british+gas+smart+meter+user+manualPDF 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_off0000bcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB1 16516 bytes
SHA-256: 2d1e7cd111534bb7346137ec404d1b171559705c1e44b389477de9089be18d27
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 10588 bytes
SHA-256: 43ff6ea48ef63e0b14c87a1d8650304b1d9f5b2e96b2126c77125de05d441bf7

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