Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6ec9d3385caadf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 17:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9ffdc4fa0dc78c6cf66b4141ec3f55c SHA-1: 7c85530cdcafc34e7669f2f434539b1ea2fa9981 SHA-256: 2b6ec9d3385caadf0ef8379deddfd7ea73bc5786302d34b999f3bebaf904f591
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious link farm designed to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://jetaime-shop.com/files/pufad.pdf In PDF document text
    • http://ttc-investco.com/img/files/fufojidumibejoveben.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/62536624006.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n1bbfst9r8lmovrjpngo289ni1/70149848480.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/65919183934.pdfIn PDF document text
    • http://mfcpavpos.ru/file/73168803272.pdfIn PDF document text
    • http://jar-ted.pl/file/67735465980.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125037688290---jufovugizosakopuburuzev.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-12/20210712211704637252.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/03c8ce10ef8d2beff53f92c0e166b4ae/mibagaxovewadidituvit.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7751df80---sosiradowatagel.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/xonigewilitopedoronabo.pdfIn PDF document text
    • http://lse.hu/userfiles/file/97140153901.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/33925358756.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/lutorig.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/bukulonowosirafuwepokam.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429024649847375.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/vuzuzifatonigalevigel.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/89929260873.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/64278558713.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xagogulobivibujabaj.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7c99ae4f67cb1ee8ed6b4c5a526abc2c/75163940658.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/49866002733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=department+exam+question+paper+2019PDF 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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 11180 bytes
SHA-256: d4428a22d98c1775d630adeb81a4e6035875f2d8f3c2b12e5f70e4fc2fd544ef
font_01_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 18620 bytes
SHA-256: db5d4929221847aa0b61a3210d388dddd05b8717f36cc520a107ddd026e37235
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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