Malicious PDF — malware analysis report

Static analysis result for SHA-256 558879979a175fa9…

MALICIOUS

PDF

91.8 KB Created: 2021-07-16 17:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ca8452327f07b95048808d3598b5f60 SHA-1: 608f42e6a969ccdbea71d2e825e7094827d8a45a SHA-256: 558879979a175fa9e7c7ab788b328bc60c2aa61bb8dd55522082b8c6dc27b732
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the nature of the PDF as a collection of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://immobilieninvestors.eu/userfiles/file/wukatimowilogabodagoxad.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eacq9283ab7o1o5i1lr7vnkl1o/wulerisoxirigokisiminekif.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/sl2cj46g2fias45p8avr97jiko/desazanaxozewaka.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/rakumimu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608486eac853d---36457290515.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/dubiwogumax.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d911753016---51364075703.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/59216299645.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6c51b07b---52085243071.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2c61b22fc---41213304222.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fe4bfb97b74a9a6bb8c195ba2b076958/11675334752.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-7/20210507005835657853.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lanimamisevabaz.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/20247926850.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/90821798719.pdfIn PDF document text
    • https://brakos.it/file/ribizufapuve.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/krcqpalfm2d6l9qtd0lhtntdp0/pezilogowemunudetigelul.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db625720d365ed868fe1f2dae765baa1/44376531392.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/370842096.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f059fcb6---26447783772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=one+acoustic+chordsPDF 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_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 17416 bytes
SHA-256: 9d5528989ee78e678e1945ff60c919cb0bd9f42bbf242033da77c0a00767e64c
font_01_sfnt_off000130b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 10544 bytes
SHA-256: 360ccf523e48bef34764f8f54bf471b3f1c77b478c8923c67a76421de359a77e
font_02_sfnt_off000148c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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