Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e989d44b437b635…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 23:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b60df096793fffc79b79362e4f20dc8a SHA-1: dad6fd519c209353a8bc02f7140b2edf9113b545 SHA-256: 2e989d44b437b635e972143f1840a4dac680b60c33206936ef0cf66336d7feee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=valuation+multiples+by+industry+2019 PDF link annotation
    • https://creativitagh.com/pevron/www/img/file/kexedabo.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/naxisonekej.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/guduwonoxenutakeboma.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/5438512202.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/berirosuxulevedufu.pdfIn PDF document text
    • https://profesa.net/userFilesfile/jesefug.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/lelatenanogeg.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/71022037708.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/21723442073.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092910575473499.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32fc9c6ed---piges.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/poterub.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/10863911952.pdfIn PDF document text
    • https://beylikduzutabelaci.com/userfiles/file/daxaburorowurilanusubu.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/m3l71mb34pn7fhp5gd78cuerll/67929186778.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/22201308173.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/92341137966.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/37870358668.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/24858779244.pdfIn PDF document text
    • http://anninh247.info/upload/files/15781128963.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/2978283011.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/2522542792.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/afa8d5ed6ab6cc6996d6e5f5bbe1d714/69844728338.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jejifixoxumajitoja.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/21165163206.pdfIn PDF document text
    • 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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 15304 bytes
SHA-256: e28932ad131213dcb49f67e48caedb82ef02504982ddd408322f93c107d41893
font_01_sfnt_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 11340 bytes
SHA-256: 5956d45f1ea612c6651e3cd865301d4f1b0d8099d72508766b48e2a08f8b26e6