Malicious PDF — malware analysis report

Static analysis result for SHA-256 9909062525dbc9f3…

MALICIOUS

PDF

85.9 KB Created: 2021-07-22 13:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ce934bdfd4b97b24e97e7dc666e3b14 SHA-1: 02973b54462ee98f3a541203ea543e669a280a69 SHA-256: 9909062525dbc9f324eb8f2ce88b3ee86da5e5d83471f00849e17fd85be25dd9
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating an attempt to distribute malicious files. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a coordinated effort to trick users into downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://cuacongtudongbinhduong.com/upload/files/46059733550.pdf In PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/tp3upp8nnei6sked0ct8ninam9/92487018285.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/zifizupegawe.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/715f6c1c6ac067cec58a6b429529849e/94241694527.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/687662edf5837b52d65107a624fa1e3c/tofibazutibomawitimone.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/61108971694.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903f6b47c69---jezonixujewudo.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/bd6a4b1d92b0e624dea40ae266d8c298/parupolakela.pdfIn PDF document text
    • http://midel.me/userfiles/file/riruxibubew.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/dowivuligejuj.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825264d7ce0---67008363515.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/mipuj.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d323111ec---63492601441.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/56055345786.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/f85j77kc49sl3v3i1fd50aa7h1/71936307797.pdfIn PDF document text
    • https://gilbertems.com/videos/file/27709089892.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/qg6gl3nuqkre51cp7gkfu6qfa5/91789753734.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/27981537723.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070c88d84e39---xovulevibujivitaradegona.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/c5tr4rgikp84m76b28i77sv3s9/nijitizibatek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=save+wizard+maxPDF 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_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 17644 bytes
SHA-256: f1a1650c03baa5bc2a5397cccc494e6d4b201511528dbf867e33fa4edb04c60f
font_02_sfnt_off000132f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F1 10260 bytes
SHA-256: 961b3082bbe3904263c4fc41e20893e1e6a53fbf20a2401f11c254bf8bc8678c

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