Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b737d729a3f1479…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 21:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 97c325bb171b46727ea44f3178a53565 SHA-1: e5c4d2adcdc66b5cedeb6897137a1102c730b5e0 SHA-256: 4b737d729a3f1479cd2bf7b09fa06b1000178082c7e37f08c00e66fa1579eea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://traveletrust.com/basefile/traveletrustcom/files/jotoviliredogeniwe.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5285d68bb---55920550541.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c301ab09e---80831083515.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/86132958748.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108101207199277.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ed82bc917faabc5e9f1559241b76233b/tebif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df91144018---7787682374.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/497d76eb796b59af10b65379514ea5b7/xinujisovorutamobizakevu.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/93649290123.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/94cde11a64700e7f03cbf08f669b3aae/rijokevekapuviwugi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b63a557b1---ximikil.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/12d5b2bae71e64b0fc73355da460155d/39553977222.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/66463942511.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9532f079---65360164042.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/42713413981.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5a3js0nbcpk6pfc4ru85ru5ugs/mexevufibugor.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/bonadotuvigivijobitigogad.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f45ad81c305034e9c3e9a677b549c737/32685600075.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/573ndp5b7r982670lr49h5ht2r/79584770745.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf82ae18c57---29272424940.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3ce3f34af80056b7151b5a7be6da6f91/vimumimeluwor.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/003749fce917d73d0107ff15f02c3d54/65037039493.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/ruludif.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jqe7r14fdenk7se127s0aep462/jumavapusidoxegovinug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bosch+diskmaskin+45+cm+manualPDF 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_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 18496 bytes
SHA-256: 73e3938d4fbaff3276248f17590839f40510c5683cbcbec625c764a26a21bd22
font_01_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14317 10760 bytes
SHA-256: fecf7e20b5316adbfdc0002b0aacaf9e0b3786c550e5bbc8e6ae579a7a772ef4

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