Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caa0de40cccb8c3…

MALICIOUS

PDF

121.0 KB Created: 2021-10-04 12:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ec77cc20f8f2d0173212e4205c54a26a SHA-1: 3790e9eeca1057d07662391d1b551ebac978629c SHA-256: 8caa0de40cccb8c3028ec282b54c3a51686a3bb8726156797a6ac2ef509e7f36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://hairtransplantmangalore.com/uploaded_files/userfiles/files/puxaserizozemi.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4f71eb34c577b2138b64b20ad83416ba/17741378315.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/66562250943.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/67989319509.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/20896090579.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/bovulexuwo.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/10855074430.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/12722401887.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/21135091835.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/54705706123.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fb825e65838dd1319fe86ea04855654d/rizipisotuwarizexaxevadi.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/86741716861.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/7khklj53hs022qkqt2j746pfij/xuxupitafe.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/tepaporijamijegejupadolug.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/19335995323.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/zirub.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/86d7c325254136327d704611c1a75d75/sujawaraniwikilobojonen.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/45170803029.pdfIn PDF document text
    • http://centromp.it/userfiles/files/navosazizukubig.pdfIn PDF document text
    • http://cartopack.be/Images/file/tilidawojejotamadutinapo.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/38037311059.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9607d3522bdf987ec8d3478d254d95bb/jimogedusabafinafomimiwu.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/6271243483.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/11913808735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cedric+diggory+the+cursed+childPDF 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_off000170a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000188bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188BD 10628 bytes
SHA-256: e3218e7678f232b8f1a158c49aa20eb65e8f5964d17a2f18797b8750ca2d7d2d
font_02_sfnt_off0001a103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A103 20664 bytes
SHA-256: ed4b680db51d2ff276ced0a8cc42b4f236473fef30994a0c82f36a820b71c8e7