Malicious PDF — malware analysis report

Static analysis result for SHA-256 885c88c1efa0e433…

MALICIOUS

PDF

89.1 KB Created: 2021-08-17 11:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10f87e7510adf5ab38b516fcf0a9c06f SHA-1: f4377cd688972879d63b56f40bbc1f9f21531e47 SHA-256: 885c88c1efa0e43359ec8d17ece2c45c3fe37e4548604e5719bded6570ec2ee9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs strongly suggest it's used in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bioesteticaonline.it/file/39988856284.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4d1dd5d6---37636717124.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/simadekilobegipuma.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/23091861221.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/xutusabuvigivadefijano.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/bejotezagikawekusoneja.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607785eeefeae---35611664695.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e78bd2d93c9a9a65a3179deadeee0306/vimixox.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1623533120.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2f1478178d5437e09886fe155ab3ff2d/37203295402.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/66895855051.pdfIn PDF document text
    • http://maihome.hu/admin1/file/bopikixusu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9b29d3ad0f5ba254902463759c9863f7/63731930367.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/68551190498.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66d43ee0b0---56876869552.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/gusosuvivu.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/foxexisuxuvunulu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/fufosijolidegejenavajuxo.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/71873909260.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160752900d0f13---doteroxivob.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/66862355234.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mr6hsr1e86mi4psvrardifa0l4/nidadamoxefobevagirugunop.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/zodolo.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/j18eflbq2hjc2ph1e73f0jo8d4/8299285808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=software+architect+interview+questions+and+answers+pdfPDF 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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 11144 bytes
SHA-256: 9922ef96d07f4e97044be02a48c04f890e756f7ef4e21ef445aab3d87dad9aff
font_02_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 17484 bytes
SHA-256: 0b48880a5bb966cb69e33aa40c19164e487ad980961ec4e8b561b7b50ec23521

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