Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f3cc2afeb97d95…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 02:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 106697b2a3c83d7c92207cb06c8d369e SHA-1: 1900c5e890b96f8506d2813c3135e1b57cd49b94 SHA-256: 24f3cc2afeb97d95cebbb86474ddaf5a10ce6b2ec27ba52698a7e977be4f0d4a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=hasselblad+500+c%2Fm+service+manual PDF link annotation
    • http://kengosushionlineorder.com/uploads/files/nawunesapanasetazub.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/jodatupapaf.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/desaxemetomukipokinone.pdfIn PDF document text
    • http://dakmet.pl/upload/99951328359.pdfIn PDF document text
    • http://school15-tyumen.ru/f/salomebidalowinof.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jiwutedenetija.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/863e95cc2e5d08f9a3c11af88a4dedb0/95515538053.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a7032fb8ada5cd9c38f0c8065b58325b/zavopenixiditogazixazeli.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/62927815366.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/junerakibigak.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/6726747091.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/wowutuvevimuguxudujemi.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/64396201397.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f3924295a91e4a2546822cbf66f39c73/53551223157.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/73278342917.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/44820293503.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/81708678725.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/42123978844.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/jekomabawunoger.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/wotojademapizejodozosewi.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/18366129756.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wakafixufat.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b7150e6d---kixemutekupuwubow.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/nitawotufub.pdfIn PDF document text
    • 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_off0000bc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC44 16780 bytes
SHA-256: 6e0ed4c7ba8ce488f4bdf96542e0e106e3d441acf3097dc7d251a7ad96def2c6
font_01_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 10900 bytes
SHA-256: a0d516bea3a0616148234c7affa11b739625352a40612e838ae0c8ee120e2f01
font_02_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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