Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4b72eb7d53910f…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 02:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 21576494c2f305c3b2067b97c2ddcb3c SHA-1: 52628a4a3a534c46b38ddfe2cdba85ab42a77ce2 SHA-256: ff4b72eb7d53910fa66c334700247b82be0e9552436c9492793c0954de040d60
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample impersonates a cloud document sharing service, likely to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to download further malicious content, potentially exploiting client execution vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://marjoyunlar.com/calisma2/files/uploads/88497569109.pdf In PDF document text
    • https://blindnow.com/userfiles/file/bozolujisotalaju.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/zatewadugedovavulejepu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8k50t24cgjio8tmo5psp77ceu7/60836252030.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/zamofiw.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/30292593820.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81d942c13---ravetoni.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/mimoxomevodarewodezixer.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/969de17vv47m9dbm5606ueb7m3/19793677498.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/65819513227.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/vuluralezotubarono.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1bd6d56f---8954538238.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///55509076043.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/fonijokutuzuzine.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/rufofufakire.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/muxabowojepowitut.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b444d87002e---81609070338.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/n7365gbsvb5a6a8rblnvit1j9v/43146763835.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pf6qgd0f8dg5cdog6c85gpq0sc/3802765159.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/480275871609c537da9ba4.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7c9b6be4c372e46d045fcb8d294df40d/xuxem.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/jugetubawovugaxodifawog.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160774e74cb0d3---46267456586.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/66504319561.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a7483b2049c01e4f92d6e4a2df125da9/66080688473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vision+board+printables+for+studentsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 10700 bytes
SHA-256: 88d4f94ad9e97679540b21fea4b3f786eddae8cb414ffdb31ca2615805d02dee
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 17804 bytes
SHA-256: fe33af9c7d4f3d9752b1826d47d4f15709cc73cc55dc9e1e4c01a9389bf886a7

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