Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e86baed13b2b3f…

MALICIOUS

PDF

78.2 KB Created: 2021-06-28 13:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: adc68c6832297e5b7d0ebde1405b334a SHA-1: c9e54cfdf89adc2bdf5df68717544db30f680793 SHA-256: 44e86baed13b2b3f0e17c77eae6179be6f45fe99c1827b08fc8e915f24b76cce
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ms-krmelin.cz/app/webroot/files/files/60091366466.pdf In PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bdljte37ruu84asn4akabvkfmd/litulufi.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/nuvubulalefed.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b018b78d2df---93069669082.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607aadac2d91b---80708844794.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/21178728585.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e93ec256f7---butib.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b80b1193---jeletosisoxe.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rikoxerijam.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/be5hpl4ci3aq00drhpkob0v5u5/pigaroretusaxufufewekofo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd76e8b6a2---boxivaketuruzodegedum.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/27467425404.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/441f82f2b3b2c22b3b567906ddb8d4c5/83469433899.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/gkdef4bkdufvdjaj6qrtkbunfq/42095698745.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/63355843cc15e9c9853a6d02785664a8/20697451800.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210604_043043.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/17be3666030c6a3b39467440f123c7d8/5384195218.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/3013402056.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j8vgi7mnkcr71a2ajif4uv51pp/64477794376.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e3461fb9---vudapumetuxaworutaw.pdfIn PDF document text
    • http://indecomavo.pl/inc/77012920607.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b381985d7---webesiputozutovutadu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6q5c2qpg9bdf68csu3o7hlva40/liladevivabemixonodibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=touch+with+lovePDF 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_off0000bb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8C 10008 bytes
SHA-256: b606c37c000846b70a447a57f83e1c69dd0817e4b061161d9a823af5a8434fb2
font_01_sfnt_off0000d1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F3 16716 bytes
SHA-256: 223bf96b5b2f482510fa5f9950cc47ebfe44e067e8defe9c4958ab4cf799f24c
font_02_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 16352 bytes
SHA-256: 4f7fd471b44cc023693bb950ed88358f6a265b80151bcaecfcf91aabad45616d
font_03_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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