Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c00d5a6084cf0d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 13:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f227562d9bcd795f0842b9e527ae6855 SHA-1: a4f8cd8d321c983efb8e1f674b049ca1e591ee2f SHA-256: 42c00d5a6084cf0d461569fedbab5f5a7956e856865610760d8b8387927b1d7c
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on a variety of domains, many of which are identified as disposable or compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nasfthr.com/userfiles/file/84734021013.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427d811b657---ferubajon.pdf
    • http://engroupe.ca/aym_image/files/35379795266.pdf
    • http://drivingtesttips.ie/fckeditor/userfiles/file/71230813006.pdf
    • https://csodamalom.hu/files/files/lakivabifapusotela.pdf
    • http://gartenbaukoeln.de/uploads/files/zewoze.pdf
    • https://dijitalsanat.link/upload/files/56870346935.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/15566121118.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161416b7d43418---10649467030.pdf
    • http://xn--80aa5alfu.kz/file/korogir.pdf
    • http://plncse.hu/php_data/file/jefenupafon.pdf
    • http://linza-market.ru/upload/files/41036405079.pdf
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/dawugoxuduk.pdf
    • http://ccswcd.com/userfiles/file/nogemolulovolifixojediw.pdf
    • http://turnyras.lt/Files/file/susinidavaposorava.pdf
    • https://virtrade.gr/userfiles_lybo/file/pasijikaleziwewo.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/28406843341.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/61198311609.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353f502aafa---99158550232.pdf
    • https://devcons.org/uploads/userfiles/files/vumeganejolijopituma.pdf
    • http://mt-filtration.com/uploaded/file/11954058076133fbb128425.pdf
    • http://advairtech.eu/assets/userfiles/file/wuvepuvugak.pdf
    • http://thepokeluau.com/uploads/files/6494747100.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/67511811877.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+fire+apk+app
    • 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_off0000da2b.bin
4746fc4051f4732a6492de7c9976b7406643f24141c30d0fd46e3ff5d24e04fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 9884 bytes
font_01_sfnt_off0000f002.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 16792 bytes
font_02_sfnt_off00010814.bin
25b99a6350e27dce62869ee2a55900881658d4ffc84b0cc488e98fdf7bf185c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 17860 bytes