Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c18ba33416581e…

MALICIOUS

PDF

82.4 KB Created: 2021-07-08 06:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f6ed96ceef4feb4264e671bb9535e039 SHA-1: 3979090593e9add456cdaf6c326302f9ca50003c SHA-256: 39c18ba33416581e36a04ea8d0aec23db6cd639d608e11c3a4bd615202044001
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics related to URI and link farms supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=bamboo+craft+house PDF link annotation
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/begotexijajavis.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/6743442286.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/gaxawid.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/wifeda.pdfIn PDF document text
    • http://uci.ir/userfiles/file/nunuwedabelawamojidix.pdfIn PDF document text
    • https://ultralloy.net/upload/files/ganetu.pdfIn PDF document text
    • https://castel.ro/userfiles/file/negavidesuboge.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/lazabojenidaxorokok.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077738794b0f---35502594074.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/zuvesabup.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/35351795946.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4522f16b71a3be3ac8772f80b2bece07/63433438006.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/lazuwixi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/pj2qrmlatpu1dfca700i27dh44/49939605453.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210527053450.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b81040d22---69660053445.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49b85df794---67919758047.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/v3iq7fqvtnv8tgorg10grd2o4o/91174990706.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f4df663d899df5114133b95bc574da79/vikizixirevexobilijizika.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608126cc71e88---22139001713.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c16d0fddf---vovusuxanod.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5c8bbe2bef68b167cdbcff38382785a1/56911749360.pdfIn PDF document text
    • http://nakatka.com/files/file/40062959032.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 10652 bytes
SHA-256: f79c7b62968c81c77e0d5c9824e1c28b71ada99590df78e8f75a48b4e4a6538d
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 17844 bytes
SHA-256: ab9be920f8e5761f15c0b465bb47044fb281afafbbc5a4805c52f3fba506ca12

Open this report in the interactive analyzer, or submit your own file for analysis.