Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17d8a01c31da28a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 01:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f3cd232d94f06c40758f6f7bf7b80b76 SHA-1: 039180317d16dcda41726d4826ea62093f09d311 SHA-256: a17d8a01c31da28a920ca353847fa4060beea2c43749b5c591ab078b17d9d4fc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggests an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and heuristic firings point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://winterwonderlandzundert.nl/uploadimages/files/33794909140.pdf In PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/715003646.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/46388971995.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/45532122947.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/menitojapexaz.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/25224972704.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/kolagotonuxofudopigoziwig.pdfIn PDF document text
    • http://findacommodity.com/upload/file/88240680776.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210923_fb60d.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/dapemi.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/74109736486.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/lasegadobibokorepamiz.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/vazizurarubexi.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/tawurarabed.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01318a89c---36331278303.pdfIn PDF document text
    • http://minipit.com/data/files/13822850506.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/mupuxewexap.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/31b428d5b647e4d971ed843226c31215/donup.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/31197274584.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5mckboc6asc3lg5lht3j16sa9b/mikofedexixerolitamolifur.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2eb2700b---83756942874.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210917043058.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/31143969143.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/25819083458.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/747037e051a27567be6fdbacb91af74c/86008585204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+change+launcher+appPDF 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_off0000b2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B4 16380 bytes
SHA-256: 28b217161dc556badb74f6be99476863a99d965552de8a9717b78fcf692c3f52
font_01_sfnt_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 10608 bytes
SHA-256: 1847d99e808bb390336a7d7a0aa08ae02c2d5fae5ee9842188131ec6b94eea63
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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