Malicious PDF — malware analysis report

Static analysis result for SHA-256 7284b83a0d68acf8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 05:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30f1da3ed39cf138610d2636fced55fc SHA-1: 76f6d185af85a8fd355af9ba3e38799a8508698d SHA-256: 7284b83a0d68acf8a371e56db20107e66bf357629523d98035ecc4c8b17fae49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://topenglish.sk/app/webroot/gallery/files/pelevezoli.pdf In PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/nirefaxetabumulubinadak.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/supivasufolikabejapisirop.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/rcmqkarmb4pn0v88728uj90vaj/lalamaxukogixuxatiluravum.pdfIn PDF document text
    • http://splogservice.ru/content/file/23849056606.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/47073234080.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945378f0d23---mofafotogiligutofa.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060223143810.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/63292645546.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/pojulojejufavuxab.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/monojolobulovume.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/29291107928.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5e9d924fc9e3d7ac4f82bd89abcd9348/ziveduxutonefemabimipem.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/291dd25929b954a91b243cad961f5094/89791421324.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/39815506877.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/76785590963.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4c2d36d3---devogabuzuxu.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/bosok.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/wodafodimepo.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/piwemizadawusajabewi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bukaler.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/45952432345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=islamic+names+with+meaning+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_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 10884 bytes
SHA-256: 5a50b5aad4508d2a1d706121c89745696effdd63198b9cdb0e3ad2c0ff365033
font_01_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 18628 bytes
SHA-256: 3e986f45be3e0438232dd68f6555865c02cafa5f0e12b820df7e214990aa3285
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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