Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19150b1c2776127…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 22:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5cfb66b60a276417cf654910bae0f5a3 SHA-1: cf88946b8d1adf16ad2526193b08010f1e53ca11 SHA-256: c19150b1c27761270a01d9293a14a68f52ed9e1ecde0fe7e0a8656f4459d7259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pajurioverslas.lt/ckfinder/userfiles/files/98680888218.pdf In PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/da11d7632eb0a2d506fe1465ed6291b0/97402303325.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c656ec2ae2e---gulidujigoboj.pdfIn PDF document text
    • http://hai-bi.com/uploads//files/202108110225589552.pdfIn PDF document text
    • http://cityfate.com/files/files/37494396141.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/17255764951.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/kotarigesirexonivise.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/dibonuk.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/469bc1996504c2caf14ab4772d7b83da/tupad.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/35072113863.pdfIn PDF document text
    • http://talleresjpg.es/img/file/9020136431.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/17659215522.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/81395410183.pdfIn PDF document text
    • https://aashianarealty.com/file/voponowejodawepozod.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/403b415717e9540ef129e560bbf16ee6/kofitaririvamuzojop.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841c82e7c58---82416145842.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/89746048607.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/moejgqpen4vqatb9pi8e2o37b2/vasunokawowibir.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/95446772120.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/tojosomatuzofewodakanozoj.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5ac4d7c41bd5029ed0e63a1c142a372d/tajikiro.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/6e524a82d923f6414f8af24071bc7f93/46419659840.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/9tfp0v54l3n7cp2vob7h20jen6/zokisazeletekolizufusik.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/4da9977dcfb61fe1c3d21090630d00c9/womusoneza.pdfIn PDF document text
    • http://gysanya.com/upload/file/210825185330342829v13g9lar2rno.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/lusoputalumez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lab+assistant+old+paper+2016+pdf+downloadPDF link annotation
    • 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_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 15300 bytes
SHA-256: 774f1dd2c52f725d71f4203d8f174d77dca0173b66a66ca9e5b9b38126003647
font_01_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 11136 bytes
SHA-256: 4afce1e3657477ef47d5e0a1a435f5176d943915097c8925cf3bd02bea77dd64

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