Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d99e11f2386ff0…

MALICIOUS

PDF

76.9 KB Created: 2021-07-08 04:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1020ce08a3b7ec0b8e77a94ab86a7c9d SHA-1: 63f43eb1e3ad19c67b1568f6723edaa272e269d9 SHA-256: d8d99e11f2386ff0bda80830ebf0fe5b2605e3762e41b03c60d35c55d77ec4ea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=the+stonefly+fly+shop PDF link annotation
    • http://allasclub.com/campannas/file/57732033212.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b667770432---lizoxunoxiv.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6f2e8b8abd4aed8307bad44ee2565d68/mujexazijunugumu.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/rereji.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iuuef4ndeft3i0p8h5t9849a6l/joramovapipuxaxalesa.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e168420a---80734877269.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607406317dba8---maruxudidazoderuma.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/trhlk4udtvjk7o2qsj1k7c32m9/dizukatifasizitememejeje.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3s0soi2qglfp9n9bkm73oo0jaj/gaxesisowanivex.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b575de148ee---kixidorobibusitogaxatadaf.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpsls1p74d0ln1ua5t6aooortj/tukorurebekofugesix.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607330865d276---webababotoxovid.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/581974549.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d0d943f270ae47bc8f45fed9361c1517/sijupoxe.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/tidazumijisazadi.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/13570502888.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c82a0df8770712fa96de9b068dea44e8/pijuzuvigugotebak.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3e60ea8379f00b842e5ca320d0c0e81e/38357523611.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/panibalofovodawaj.pdfIn PDF document text
    • https://isosklo.cz/uploads/7214917183.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/56021259937.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b6c5380e---6759587890.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/kawipidagasitedadalibiv.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79002e0c32---79388828180.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f474bd9769---65277288607.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f807511a6899447559d70a17cc2b6ad4/kulani.pdfIn PDF document text
    • 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_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 16340 bytes
SHA-256: d72aae4fb6415f1c0528f08bcadd47552489825975c7a40dadf29bcd2033cfdb
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 10176 bytes
SHA-256: 1e5bfb9940d6794452cf3d9829ecef1bba3b8653a818409a1bf24664b9fb7d22

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