Malicious PDF — malware analysis report

Static analysis result for SHA-256 016accfac5522b5a…

MALICIOUS

PDF

83.8 KB Created: 2021-08-15 05:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 16b444ba020f702c82e4cce91a9eaf82 SHA-1: 03358b1fec5bf09c05cd726b798b84f81c724305 SHA-256: 016accfac5522b5aa3d760c51c1ee0e5aafd144411b9c1001bcb044f4d2bac67
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirection or phishing scheme. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=membrane+structure+and+function+worksheet PDF link annotation
    • https://alianzatours.com/imagenes/file/lodasitujiwolinex.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/kemolupifikajuneripowegib.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/8604415611.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/nonej.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/51853091846.pdfIn PDF document text
    • http://poorclarescork.ie/images/38874758179.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/sagekujurozosafisatiz.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/13355096827.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c739a9872fc7db8710b830e5b5aa2e6d/57726992584.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85d440984---6665474520.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9f5f9abcc3a2f869e6995d96c37f714b/64828853365.pdfIn PDF document text
    • https://digireg.cn/upload/34691528408.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c6fa42306c2993efb111a9930100ec6c/91955039409.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8629c79e2---89880344188.pdfIn PDF document text
    • http://edallyshop.com/upload/files/konifumoz.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/widovateduxoxuzikodenaxi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969185d792b---sigijutikerulidagin.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/figagum.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/76a312fe04b2a45d930a5453a0b782e3/85538987926.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcccb156c9e---37318904257.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ac4a51586773adbe18dcb09cee49fbde/27027957412.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6fde412a87100df76d22df691301c7fc/voketusi.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/zawesibixuriduneju.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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 16256 bytes
SHA-256: 99c5c2a4ad635778ca7aab2f6d7875d81d1754b56351eff4bc71ec9b6ec7a154
font_01_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 11108 bytes
SHA-256: bf0304464dd67ddfbec839c013e3991d20ab84a41abfb4d2180546d6ba215aba

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