Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0753517e0b157a9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 23:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4657cd6c4c48faebb4192ad0265d191 SHA-1: de164a01b827424156890f037ceac2682271ebfd SHA-256: c0753517e0b157a9b4f8d0ee4e7849db66fccce8a994474b9d9f234f808949e3
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'express+vpn+premium+apk' in the query parameter indicates a potential lure for pirated software or cracked applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://protectname.xyz/whoisprivacy/userfiles/files/72659644611.pdf In PDF document text
    • http://massageindex.nl/images/uploads/danutupub.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/73451433145.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/gedujubezetawilifimon.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/worokapewake.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/13205290506.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/zuxiganokatulogalade.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/woxitevotudewawafejap.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-20/20210920162800429620.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/86369025219.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/litatulidim.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/77775746861.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/vezozoguxujok.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0a5d8db3271249e8e57a67d75076b4f8/40024597772.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/435954029f7a7bd438a76691f3e65c09/46028033349.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/jagobale.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/8122717597.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/82668237553.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c45321b3edd68bee6ab6d22619ebedc6/17968103221.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3f8af6be432129f640ccc50e371522ed/73362843999.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/15259000229.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614191417fa86---97439358691.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb4ce6a0a---22044815864.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/saviladavipetozaxalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=express+vpn+premium+apkPDF 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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 10492 bytes
SHA-256: 97002562451a9f52783efb926cb18c4182057bd53f3a049a501ae306c66e104a
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 17600 bytes
SHA-256: 8d71e8919ca288eac373718002c26b7c22a1f4e2aa62ea61c90ed5e4b6d7f738

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