Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9bde68a45d4209…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 06:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ffe3386a3a83f8140d521c959c608c8 SHA-1: 2f56960fa7db61f9539f4f2554b73279fc41404c SHA-256: 6e9bde68a45d4209e41f795da2aee8855ebb62826c8d3d19a9eea8f21b47a931
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://al-farh-iq.com/upload/userfiles/file/73497310300.pdf In PDF document text
    • https://soechi.net/userfiles/file/25655927612.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161388a17e44d0---58643597213.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hs92f0v80agt5vp9ugo6md0eg2/domewivabituvunisen.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/50430299503.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/5600348122.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/fogadusigudadafov.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/rigonebuzilufumijelalivox.pdfIn PDF document text
    • https://ptogel1.com/contents/files/newijizagafuxa.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613878a5e6666---70490834763.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/winigemulotexukoxogatik.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/66984000193.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/14641071905.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/fudawafutemaluworogedo.pdfIn PDF document text
    • http://status.cz/UserFiles/File/zawufisow.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109101807242254.pdfIn PDF document text
    • http://bronia.org/userfiles/file/50134790085.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/garixadubase.pdfIn PDF document text
    • http://srilangkapools.com/contents/files/mebetodonopikezobanejine.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kq43gksaavffcbg0tj8rkhd104/16254444407.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/nemajiwirewepikafuvo.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/91678201411.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/pegupopenugaxi.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/18594159604.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/zotogaxasewif.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/binosevex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fundamentos+de+electronica+pdfPDF 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_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 19508 bytes
SHA-256: 816b99e7ba319e6229afa5ced352df4e6e72609d6b7a62fccc7c88d3c1295b4e
font_01_sfnt_off00010d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D41 10860 bytes
SHA-256: 52e38fa051bdb5846c1928d4453add15b227c1f5db3e6841e545196bf520773d
font_02_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1