Malicious PDF — malware analysis report

Static analysis result for SHA-256 8805952a85d0f08c…

MALICIOUS

PDF

85.2 KB Created: 2021-08-26 21:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d33304cd89aea632c13f3e094964cc18 SHA-1: d251e4f9ea26b749d0e7f858545809646d4dd341 SHA-256: 8805952a85d0f08c403f8ab2dae056ad8dfcf85a748ef5ad5072efe5134ada6c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://allytemp.ru/uplcv?utm_term=destiny+2+pc+solo+matchmaking PDF link annotation
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f8a2c692---78849628406.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6520a413---sidagaze.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/52460213099.pdfIn PDF document text
    • http://texmet.pl/userimages/file/vijamibaluperaw.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061213563828.pdfIn PDF document text
    • http://toonesk.com/upload/68008560350.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/45570715281.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a37ac365ef---bulijo.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/zevakew.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/75448570232.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wawadov.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/wosisida.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/53027771345.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/47501590727.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad476609ec3---sixixisamidamerulop.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c7bc7a4e261fc4b0c9b8a998f8d7c049/gutipagitudexezuxedilakor.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38676132097.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/3680785602.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/wenijogididagaxeketuxe.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/85d37c5ab655f60847eff250fbed9ece/povawufikakogekone.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/51282586427.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/xukuzeje.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/24cf5dd8ea143433ff14cd5ae2380fb0/rosomorajevaxo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160957f941ba1d---gelalezekegegigisoki.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/vupajafiwafubawularewered.pdfIn PDF document text
    • http://www.moyekolodin.com/files/ruzedazopulafilejuneko.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_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 17140 bytes
SHA-256: 6839ea4ba233d7aab3315e8b17d7ffb2ead2d8fd32d1207f2c0dd28dabc1a157
font_02_sfnt_off00012cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 11048 bytes
SHA-256: ac187dc276c051174b41e728d5c232ff79dc41aee3f47915326a4c3a730a6b66

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