Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f56799fb3e831c5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 11:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9cd376fd559579b4d7994f5e014a87d SHA-1: aa1e94ae39394e5ca73089f015a16108ad19df97 SHA-256: 9f56799fb3e831c549a1af791f7603a8b86d98c9c47f3fafa99022743d8f44f9
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=a+composite+number+has+more+than+two+factors PDF link annotation
    • http://emirates-offshore.com/uploads/image/file/22838093374.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca22c2431---97981226924.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374baac141a---fujezulusukaro.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905120505_axv9cu.pdfIn PDF document text
    • http://www.depomatrial.com/file/zipaxovaxawitonalej.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/mofev.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/50613957017.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/buroxuwidemixibaba.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/vovuwo.pdfIn PDF document text
    • https://baongochoa.com/upload/file/limaperim.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vuvelusir.pdfIn PDF document text
    • http://portableandcool.com/files/files/fizetolo.pdfIn PDF document text
    • http://creationart.hu/files/file/vodefifasujatil.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/tuwubepirabasi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/647417cc4b9b2049372117cfe5a8f34a/96377339691.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d259b0afe4772748e4757860c1e3783e/baxol.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090607282847.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/34530685103.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/vuxubofok.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/25604664742.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381353e02b3---59947285515.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/99028822138.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/2061229476.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_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 11004 bytes
SHA-256: 342c37e30e01f095e398179fa2c3441f86a7eb83e2e3a119d4ebf02f3a7bb5c8
font_02_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 18160 bytes
SHA-256: 267d2b0d6d1dd5ebcda34d778294c2297308f4b3c9f3ddc37b70748ec7124a86

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