Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb23c5c9bb045ddc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 12:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fe958569abce64d5859d012755b1e49 SHA-1: 19e5c74de4b0237d78a65c8c09cc9b8cc6b1ab58 SHA-256: fb23c5c9bb045ddc4527923fa47d3df15e6d21e7ef3bdeea7aa244536cc3ca19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d352e164947a5f2da771fced608a026f/xamuzenololajokikala.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vibogumom.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/29470540496.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/55080630165.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/lorufogofi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613086815a857---gakiminofewesavuwerux.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mapefixupamapipuzobopaxu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d15b5e8d---refiwufotaw.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/pulewesubelexopuwipegobiv.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/zumobakupitute.pdfIn PDF document text
    • http://videlec.be/ressource/file/dokedeselapini.pdfIn PDF document text
    • http://flirdining.com/uploads/files/26258911358.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/bejisizufaliviku.pdfIn PDF document text
    • http://maxbrio.kr/files/files/91113226874.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/fojek.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/dofap.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/dakatibuw.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/dujigafigaxekikur.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/dokevasukebaxi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306cea66a07---dafapejobokuwe.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/29948233540.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/51914266571.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/87008522439.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/12763600473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=swan+lake+oboe+soloPDF 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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10204 bytes
SHA-256: 13a9ff62460a1c836688ed73e178322ae7a34bb1d73a319e15a7c14f1892e1a4
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 16092 bytes
SHA-256: 60369b659eca7264896e9cd6df34cf0fb33d3f9a19f4030edfae6dcf22b3c2d0
font_02_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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