Malicious PDF — malware analysis report

Static analysis result for SHA-256 23da4c6469e4fabc…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 03:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f631bb557c1415121d326d18279fc625 SHA-1: 06ffcffd6f1e2d9a438a1f59f94d67602e5b1827 SHA-256: 23da4c6469e4fabcbc1b27d5503e330dc56b72c048d7e38bf9485104d73254a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection mechanism. The PDF's structure and embedded content indicate it is likely designed to exploit vulnerabilities or trick users into visiting malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b017c7e393a---telizijanin.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23e720aef1---deborakugelitinegilube.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9d2ac513a---80987627545.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/666f76710c03e1fc8966213a7a20d524/62680541674.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/nixisejufezubisebixip.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/19708547215.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/gogetarujirifefifa.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/31635936cf528908ff0e6e32b2aa25ef/23080301979.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/jejixorakijafoxu.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af46bb489d---19114387248.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/prgshn2qg69ifmopkbrsslk05l/44540430936.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/qn8ru2h474s214q0590fnne1d6/sigajikit.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tipaxujunibupixemibixo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/31556416489.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/r3r00jne9aktb8n9r92qnpl6p2/zalisuwip.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7112a1df0---pomaxikisovixat.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/9233881250.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/solamozumim.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5cb4a98b236cbde232ec2dd9966d6b9f/30949204704.pdfIn PDF document text
    • http://allycatering.com/userfiles/jawidededopo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0dbd6e43fd7f9475242ec525d390339b/zebuvixiwakegureja.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d23877403---81271733824.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf47aef73---xaruvu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/511607545b3278c3ed5dbe6e5afe4ec1/turifujenetokezuzafin.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/86254364378.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d42d73b3d5f7599472ebbdc8a970af3f/83731698599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=professionalism+in+teacher+education+pptPDF 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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 15948 bytes
SHA-256: 147ad53aeafd7294958aeb8c52b7805d24b79e8b0a72ea9274a08d9113bb6a69
font_01_sfnt_off00011b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 10984 bytes
SHA-256: 9f05d76d2b6fa7b4283a9fb539cdcd764ccde5a360f3a5bf49c819421c42a6e4
font_02_sfnt_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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