Malicious PDF — malware analysis report

Static analysis result for SHA-256 4508b810c36eaba9…

MALICIOUS

PDF

99.2 KB Created: 2021-08-18 04:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 7d70dd5c4e950ed5e7fb8dbd03517b38 SHA-1: 9a94a4daa575a719f58605166b486eaa6c6a8df0 SHA-256: 4508b810c36eaba973852da071f0663005dbd5ee1dffb40075716c1cb06aded1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous links to potentially compromised sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608f69477bbf1---37524881561.pdf In PDF document text
    • http://ashioke.com/images/library/File/goluf.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/3250061914.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/6324544364.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/de6a3c59ea3246c95de5d53ce426e699/xedonu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/silikefumikixofuvolulapoj.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/47653145982.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9d74d92f9d6a7cb8a748a149d5f15d1d/38175452667.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd4f147dd---41915331807.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/18851911236.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/dexozepifagawijudumom.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lazuzojexewi.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/84679692171.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/20ps19rgoh8hljad2qik3la1ac/zutoxopadunelu.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/25139935285.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/lakadokamona.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e1f7f240f---pagurogiziwazaju.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/gfer8t77qek6tsrktljff1uoaa/buvurogifiporotila.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/detil.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/94231916963.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gopufesamaziwa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/40903457209.pdfIn PDF document text
    • https://kristinanamaste.eu/files/wubimizaxewofim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=theories+of+second+language+learning+mclaughlinPDF 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_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 17088 bytes
SHA-256: 957a5da36f0f7a0a2b4a0f896c1cd129901a072223407f2b21f2b98aaf0578f1
font_01_sfnt_off00014cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC2 10888 bytes
SHA-256: 4b39b01309bf675950d7f9af6946712de9f739f2ff06f233acf3f7baf69437a3
font_02_sfnt_off0001658a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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