Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8e8532050dab1d…

MALICIOUS

PDF

93.0 KB Created: 2021-09-22 11:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84923d07b7727ad12eeb50220be4a9c0 SHA-1: c4e278a473e44417210e3a651f66efc65822efba SHA-256: ed8e8532050dab1de46157938398cf9197e0549666f10156523e34c238d58a01
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware downloads. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://neodentpetrosino.it/userfiles/files/19303008988.pdf In PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/bivejolokiwutupumopemuz.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/zabapifawukini.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/modomigako.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/musezawimuvini.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/vedenuganizum.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/608715779.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/15492653066.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/taxizof.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/96924632838.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8dd5ecc165ac73af2aa0922d1c20023f/29912780404.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/57246880506.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/s1d3lg2o4gkh9fjlg89f4vdap0/mesepaxi.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/winezozatixonuzakedo.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210919022205.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/vazezofip.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1880261cf---wapijul.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9f383e62---17799377819.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/wameponelunudurew.pdfIn PDF document text
    • http://webs123.com/userfiles/file/23345995135.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/31518142872.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/8444417662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+bike+race+free+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 16456 bytes
SHA-256: 70a7825fcbc029608bb80fddeaefa108d2bef0073f3cbf7fbe4666cd156b411f
font_01_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 23828 bytes
SHA-256: 1aef068b3ca7d393dc59c6048022ce3ec1914c7fae6a719accf33d5ac0bb3bcf
font_02_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D64 10836 bytes
SHA-256: 04bf4fab4f67bec18d08427d07b727c4165e5562722f46dff4787c71c482da8b

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