Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e49b3cc332cc0aa…

MALICIOUS

PDF

96.7 KB Created: 2021-07-24 14:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40444cbd423a4294452db1d7dc7bb155 SHA-1: a8221f4303a5ff9792175bb086297647a7de43e3 SHA-256: 3e49b3cc332cc0aa5b094963251056c59567d44ec66f6815295d6130265739fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These URLs likely serve as redirects to further malicious content, such as phishing pages or malware downloads. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://dailyliving.nl/ckfinder/userfiles/files/kefikebaniwawoxe.pdf In PDF document text
    • https://angkoronetour.com/userfiles/file/26757301069.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a364931244f97aac161fff73df4bc147/muxalifixafikawo.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/zowolipenivatoxoli.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d200bf8b---kabug.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/mifodademukogewerurepo.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/4955971045.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/17716727464.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/62936318021.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2cf4d1f6ac42bf979de7c5fc30365050/bepetoveremuxad.pdfIn PDF document text
    • http://cmoretv.com/userfiles/toxuximabofirepupoxa.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fidemotupikafokodetito.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7c5de23422a43d337138982d234f23fd/21190514948.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/romifojusajarifalezujojat.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c471467818e---kigorofajefufabajevawi.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/86051460021.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d74p532do8pudgsqkr338p2sg3/31261735147.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/puvomogilote.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/pizaponuvipufusupeli.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb26ac8fe0---9508783349.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c659371fe---bakowipedoka.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/61137583815.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/fikurig.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7325aa4d---35434069180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ecuaci%C3%B3n+caracter%C3%ADstica+de+una+ecuaci%C3%B3n+diferencial+lineal+de+orden+superior+ejemplosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 11192 bytes
SHA-256: af1cae50ddc8fd21b5d03ca6e0ce9decbb2d41811d172277b5f5b155ae11dc14
font_01_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off000124b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC6 19540 bytes
SHA-256: 6708a84ecd3bbeb59ef753b680f2b9af347ca17807ffc7a3ef120a7c4ccfd9e1

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