Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9da0c89adea46d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 09:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2b448be40b337e76a9ceac4abc5c2fa SHA-1: 4ec8881275c960668ab4459369696e722cfc41c9 SHA-256: 9b9da0c89adea46d31f4c478184c794a05afc854afff0a111e46df1f7ca07f0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic firings and URL analysis confirm its nature as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://pixomot.ru/uplcv?utm_term=solving+subtraction+equations+worksheets PDF link annotation
    • http://gospelpour100voix.com/fichiers/newsletter/file/nitalawesolovef.pdfIn PDF document text
    • https://airshow-bg.com/file/beful.pdfIn PDF document text
    • http://velisend.ru/photos/file/zefoj.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/bupefiruk.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/kegujazuvewevaximosabube.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f950f1e5c---50495347989.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/48309967097.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/39637676568.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/116c8b63869af79045f10cfcf89c5679/pujalureza.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/88563592314.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/12291098299.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/nalidolebepulolof.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/nolepururafopelezixewa.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/tomulenobux.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210723_0BAAE11C72620DE3.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cec03b94c39---15656580766.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f058b3e18---dudewib.pdfIn PDF document text
    • http://nfc.soo.jp/file/1787184725.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c1cbb50c21aeec1c45f5e00652613472/64760141671.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/25896648115.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/97398134575.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/vosoruxebaxositarokorawu.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_off0000b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 11212 bytes
SHA-256: 9bdb498bf3bdfe3f1d2ab520f5d539ac758d0cc90dfd87b6a7e11ec99224bd3d
font_02_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 16172 bytes
SHA-256: 7f38bc2ddcabd39e84e9cf23b6cfbc239b5963dd1fb6f3c85dd4d6893adff2b5