Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46454b5704a6619…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 18:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7645d313e055518972b18dd02a404395 SHA-1: 6da339f9ec7558baf3820b0d72d7fa6594a031dd SHA-256: a46454b5704a6619ebd5afe95cd39a9acb66ca5ad7de557cdba88abf613b6cfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://accounting789.com/ThImg/file/8728276580.pdf
    • https://comptables-publics.fr/userfiles/file/44483063922.pdf
    • http://newtrichur.com/userfiles/file/xepewu.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d3270ab3fd66fcb174eabe2187095770/85049075107.pdf
    • http://rockpapersun.com/upload_mce_image/file/geketugexizupodabipoxub.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161429e6d24e0c---kamarexaxosakegomopafawez.pdf
    • http://gorisum.net/fckeditor/upload_file/file/22967727051.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a93e7c89f---60140753181.pdf
    • http://montaze.org/democms/userfiles/file/dopefimusafoxobomekakido.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/85071100131.pdf
    • http://blccy.com/userfiles/files/36186708423.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/libimir.pdf
    • https://tiemhoahaibara.com/data/dulieu/files/40204793259.pdf
    • https://oceanflowerhotel.com/uploads/image/files/xewojemasuxorozo.pdf
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/63670767014.pdf
    • http://bigbazar.cz/is/images/FCKeditor/File/87680263767.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/11562972265.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/zodibidupitewewalezut.pdf
    • http://brlairport.com/images/file/30774100245.pdf
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/bitap.pdf
    • http://sichera.eu/userfiles/files/nikabuwot.pdf
    • http://hoteldanang.vn/uploads/images/files/54202173691.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=guns+of+glory+hack+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d569.bin
23c1f42c9eb63cad9e3f8b5c2ce9c159b847e1618abaf767ee2bd62521bf65eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 17660 bytes
font_01_sfnt_off00010329.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 16792 bytes
font_02_sfnt_off00011b40.bin
1e9a7f32e68e8c1902a606c71d97d3f8d93af22aa45f2a0783ec6b9bf14c49a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 11088 bytes