Malicious PDF — malware analysis report

Static analysis result for SHA-256 64050749e9508c16…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 12:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 919f5f7cfef8bae794bc6a3c213d57bd SHA-1: 94e3b99ef6854ffc0cba7191761cfbbce5779f41 SHA-256: 64050749e9508c16880b15d33297fc1ce86de639a346e2835eff5b132205f459
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on various domains, many of which appear to be compromised or disposable. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple download links suggests an attempt to trick users into downloading further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://sapsda.com/SapmaUserfiles/file/40657196778.pdf In PDF document text
    • https://laplacedesstores.com/upload/file/limewodosogofaduwur.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/tuwebadatedefasep.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/41936e9a09e21e700bf896325c05ff50/ninerarawukezixiji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7efae31e---65176847565.pdfIn PDF document text
    • http://kustari.net/userfiles/file/jupezos.pdfIn PDF document text
    • http://esteel.my/userfiles/file/79502327336.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1705b1db1---8435212143.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/95876979690.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/sidagajoxotugubadevivad.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/32719323443.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/44304246805.pdfIn PDF document text
    • https://vendax.ro/files/file/92766808358.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/71636885179.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/ravutiravusilodajurabeju.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/92178602750.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48451882598.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/rigotasidaruro.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/piluzim.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/13442391860.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/31837349645.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/88616236809.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6a7771d1c55d01d2f08f03e6e85469a2/41059419002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=my+cafe+hack+mod+apk+downloadPDF 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_off0000bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 10712 bytes
SHA-256: 722fcab598935f86c7d55a1f4c50faaf9dafd925b280424d1764506157e99310
font_01_sfnt_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 18184 bytes
SHA-256: 1c529c83a60c718c588af893ba3d1cf6a51cc7e1f9c72593b1a9c8b2ae1b60e5

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