Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8aa2ff99eb26b9…

MALICIOUS

PDF

74.6 KB Created: 2021-10-04 09:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72fe79157e8eb9012b7cfc82bd08f238 SHA-1: a5e41b26978251c99b09a914e82c389bc4ed7c10 SHA-256: 9e8aa2ff99eb26b968b49a566981b6e5637a4a8d55676eb61794becb78ba9d8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=primary+alcohols+are+oxidized+to+aldehydes+by PDF link annotation
    • https://macroedunet.com/userfiles/file/kelelopola.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/balamuvezuwasemoteg.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/90595531505.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/99856044529.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/wopulul.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/3316548574.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/22188884404.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/regikonesonim.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mavatu.pdfIn PDF document text
    • https://bak.vn/upload/files/rabojosanaberu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9471d0cf4---12724745387.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/lokulinupurebewip.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2799c47cc3b75db2eb19045327e73adb/89697455669.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/kebafozenebikex.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/30877734988.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/46522615786.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j3b1lak20q3upb3sct4vsk97r0/laxojabelijilodilovevusap.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/gabavusujif.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vememuzefe.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sovixakoxusifo.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/1984293052613668ef263b8.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/29346890257.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdc915a9ed---sazebotapowubejapelov.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/dugese.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_off0000ba9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9A 10948 bytes
SHA-256: eb4b31f826aaf66c41ebc81f761ae496c5dd3b261358d97380f4f860df6fdd09
font_01_sfnt_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 18816 bytes
SHA-256: 4029cd331f90338a3c593a478601b2669975f0994ea1c39113dca460ac74b25c
font_02_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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