Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe4d6286ee82492…

MALICIOUS

PDF

77.8 KB Created: 2021-08-29 07:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0155e2986295c5571dd713355de429af SHA-1: e4b9e25f1d709c4daa2aff9e0b01997edb9db0fc SHA-256: 3fe4d6286ee82492ff6507d313b0d6337e381845c459dc5db319c6997d2df244
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or phishing content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.netcorp.hu/data/editorfile/viwiga.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de177028865---newabubelizabisijati.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cbb984ba153ecbe65ec0f909ced7d2ab/zodozebolizu.pdfIn PDF document text
    • https://chp-travel.ir/data/file/48597029523.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/80189891490.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210618113231_5dr5aw.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/33716072749.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/13804083447.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075aeddbe42d---bavaginuvorenevemub.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/75064131243.pdfIn PDF document text
    • http://whatdwellswithin.com/file/24834445975.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/fineletikobezer.pdfIn PDF document text
    • https://kawanmto.net/contents/files/jagorarujuxik.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/58169359310.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/31216a3d5ffadbed0108bfdc7cc084cf/visiwesunorevewudabofuf.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8c1da0fb4---xezumajuwonawekanuzar.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/badorofudanodizasedidet.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/76868860614.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210531181047.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/86ef3c8ed4f84d6ebbe4c690035e2413/37360446372.pdfIn PDF document text
    • http://hainfelderteich.at/18938737005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=planning+and+zoning+departmentPDF link annotation
    • https://mediaget.com/userfiles/files/13123750408.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_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 10628 bytes
SHA-256: 4ac87d30d1280f0cd6fc01f0ac9e6e59b1433e5c69201d2604b1e1eee7256119
font_01_sfnt_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 17596 bytes
SHA-256: 8c184aeaf8bc8cb4f5b5b17b8b68cf7590d4013edbcaaaef816a54e29726db82
font_02_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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