Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a13f6e65d8a6de…

MALICIOUS

PDF

86.3 KB Created: 2021-07-25 03:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ab3bc8d0d4417ff98aca4b9ec1f1f9c SHA-1: 3cb83fc8e92619d418b27394eb11c1c6a2ea2524 SHA-256: 40a13f6e65d8a6de2da3857aa8b62cb610617b320c7bcf277f2d5934d16b4786
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The document's structure and numerous external links suggest it is designed to redirect users to malicious content or download further payloads, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://doosradashak.in/ci/userfiles/files/65554387801.pdf In PDF document text
    • http://techbico.vn/uploads/image/files/nuriwefobetedederirepidom.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160758214d9bbf---kefazujigevotogetake.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/begipagerosiwet.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/b9a723b0961a6988d9910ec5f6997a0f/50056027600.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/votonit.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da26e9aed8a---23098269820.pdfIn PDF document text
    • http://haphadoor.com/upload/files/96189702650.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/fujazalanimizigifobodafi.pdfIn PDF document text
    • http://castel.lu/userfiles/files/tipexob.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/40148528597.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160efd9667894d---jetalepomonilulawop.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607854d4d7ba7---sajozuxufekukivakit.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/10e34dc38f9fe8d0cc47fa9bb3c4acf5/wuzetijorumun.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817d96add45---tuzajuvoxozojamobu.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/99690776693.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ss3jb6l1afjfrv7fc7u28t38e0/gisapebogo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/59451597149.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/sdetb53qqpjqialjkid83k2i77/kifopigapimutinowamal.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7g490ngjgh1kkp3gsj8kni3937/32649795631.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/valotepakiwisubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=m+name+love+whatsapp+status+video+downloadPDF 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_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 16984 bytes
SHA-256: 3d6ff2a4d52f7e20da4d4634601d6c486d512bd03b1a8c754a4e269d0e6e2825
font_02_sfnt_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 10804 bytes
SHA-256: e87694aa02431db0b984cf124594443d5282a3c9d694308004681b99c2497b4f
font_03_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16824 bytes
SHA-256: 47fb9ccffb889cb63ccd0a4286d982111a001faa35b56924dfd1b5f836273fc4

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