Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b483675a871251…

MALICIOUS

PDF

84.0 KB Created: 2021-07-06 01:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad568e4db81c46c84baf00509cd48df7 SHA-1: fa303d6e08d7109ea937c0cbb1926f7da6c41f3e SHA-256: 52b483675a87125182ce0efa0e5a5ca8c1b47d2667e76b872622c65247b5a2cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this assessment.

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://catamma.ru/uplcv?utm_term=english+class+10th+question+answer PDF link annotation
    • https://paperland.bg/uploads/file/vowenutig.pdfIn PDF document text
    • https://mfdesign.hu/files/file/galag.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/33317721222.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/kasiburokuvezamijogawij.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719f6261d7b---jewitegeros.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160745e300b9aa---27767975036.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/robozed.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/24926723674.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/mosumajoregebotetolel.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///39845877745.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/makamakaxovezo.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/0137039003f4cb267dea335620ed31b1/94657847722.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/67408769926.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/31995954434.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2430674a---81726699737.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076750ddea3e---kezize.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/4a2f15da97e08ee784bdf3614603799e/74740774002.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/baf30e34e0bc7f32cfc537e37958588a/vodijosukidinutiwe.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9b592313---58294628274.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3179c1518f24c6ebbecfaaa0978c81b2/76047720997.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1f17c1e46---64757050819.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/didudefumewono.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ec4c57059---besuduwalebanalikajamu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9dbd6eb08---vavorapoxijaxup.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_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 16796 bytes
SHA-256: e174725dba8205c4ac1c296d17d2cb1538c56817ac4fe615a771627d8385a2f6
font_01_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 11000 bytes
SHA-256: 2e38464cf4c63f53ad84f07482418ac15b479f4b221fc1911ac5a10f4c1ee9ea

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