Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f645147945242bb…

MALICIOUS

PDF

82.4 KB Created: 2021-06-29 21:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38e418402fea5b243e67df9352b92852 SHA-1: f33ea268d66c8537fe5b1d74ff6db8210822b47b SHA-256: 6f645147945242bb1184a2f2ac7ddefda2776e80a3e1d42a658298ca3ff9d422
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The file functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. These links likely serve to redirect users to malicious content or exploit kits, aligning with a phishing or trojan delivery strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ciarajewellery.com/editor_upload/file/72577938756.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/2079e438d4e12bbf70b3397e0bc22ef4/98051844439.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607296443bd33---2521580213.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/pezatizovapapu.pdf
    • http://wujipacking.tw/upload/files/gijesurokemenosezi.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5ff4c5643---gikodu.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/287e4bd98c1c1e9bd9f54486b11898a4/74595111543.pdf
    • http://jarosi.hu/files/file/sarixitefaxaj.pdf
    • http://gernano.eu/gfx/userfiles/files/fijiwevilibax.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e2ef92693---pemakatovutev.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/87653020294.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/tokarirasag.pdf
    • http://adacu.org/userfiles/file/20210617124205.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cf1e0cb3---tukozitikojejulisukojudo.pdf
    • https://thaihoanghung.com/upload/files/bipel.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fbe097d48e3216bb8095a9f4f94fdd4e/wumowavagetexejosasewog.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78f8a2681---zijejebulovegamevabop.pdf
    • http://hzqzg.com/d/files/vawepirevumikozezonab.pdf
    • https://balajitutorial.com/admin/userfiles/file/vemarodosewixi.pdf
    • https://baigiangtoanhoc.com/upload/files/wunokuxazogozewejawur.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddee8b5b4f---62563040337.pdf
    • http://www.dereformasenalicante.com/archivos/files/geduxapojufosakaluvan.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/40aac7b24aa0f7a29292d0ab2007f9c0/77484867257.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nucleo+boards+programming+with+the+stm32cubeide+pdf
    • 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_off0000dba3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 16792 bytes
font_01_sfnt_off0000f3ba.bin
589c2f820527dcbf0cd5878f6bc2d55a62980b9e781d22a36c2f5fdf8072eb96
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 11664 bytes
font_02_sfnt_off00010f02.bin
6caff47c0307ffda34264232ad293e802884db56d609da68eb517b3028be9f1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 17932 bytes