Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cb0bc81d9bb4fd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 07:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b7ead34deebb9f010e5234294105339 SHA-1: 9c17c9f40773fb233f3f44a984a01c8d8ee47e20 SHA-256: 39cb0bc81d9bb4fd449bfbb3fdcda8b52eafa6f390128b6fbbe6365027c3f7d8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://otohondamientay.com/upload/files/lizanexofosemelizikaj.pdf In PDF document text
    • https://dobre-akce.cz/media/files/file/10618332313.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/namilogibudone.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/relunevoku.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613678094b095---rudotezemimom.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/69305024261.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ra6u0ng3o0qjg8mlhi40fukb55/19889138624.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/vopabalaxetirupuwaxaza.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/73962604159.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/31514705024.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210910_1607D71327DE1F1D.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cb470fae694c57c72b4398c89a21d51b/vovadewo.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/36344750711.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf6f49811---rulikegugi.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/5232447157.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/62166695765.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/35597705175.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/joponego.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300d474529a---zijibuxetelega.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/pulaminilonajisenonag.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/69658849318.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/79387025072.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kajutemuwiraku.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/26229995664.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/85905423915.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135b50a19d41---60508344830.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sojedubokab.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/20237421122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+transfer+files+using+wifi+directPDF 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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 18788 bytes
SHA-256: 459483f7b7af755db68fb8526e1e9e6a6169db476f1abe767a63e36c3e9e39a8
font_02_sfnt_off0001240f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 10828 bytes
SHA-256: 2e5b70b8e19b9dfe809649129c11aabe7859d123aa733e074319ea675f4d3bc4

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