Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8de61108b5ad8df…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 06:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d8fe7179f12c20e7d4919c4df9daf6d SHA-1: a099143ca9fd84ad8cc68b4fe242db7eed2b5195 SHA-256: d8de61108b5ad8df3f4f982518b3bd899e0d71db3377ad9392f468c151e0704a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=uniform+building+by+law+malaysia+2013+pdf PDF link annotation
    • http://kino-cosmik.ru/sadm_files/2532290299.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/domatedikiruzidu.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xekamamam.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072136728b77---63734562065.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f463623829---zodulexowobivuk.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/23988441795.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4f559594d46e381cf47bac43198ac084/73158602665.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/10121080779.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9d1ef2a82f70e6b06ad6cd025e140739/24516116836.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29034372294.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b044a91f8ed---fifuboluropopogexokelem.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730f721ae2---dojop.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/781789820.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/40608067275.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jonabeleruk.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607638cf32de9---5370835076.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/94411189617.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b95a9e2f19ed48e21a1e31d478dd820b/nesijutapelirur.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/62265404626.pdfIn PDF document text
    • http://candientuvibra.com/images/file/85184762112.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/xabizuzobibiz.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cf11d0513aeb713a7bcd833d72fc9bea/vubigejipul.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/1474705759.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/48008800895.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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 17936 bytes
SHA-256: af0cf6615ec8df6f4bccc042d7e9421cabbc046545ab331ffeec5e803dac9b96
font_02_sfnt_off00012799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12799 11524 bytes
SHA-256: 0ba6e482eef1c062c50e1d206c328e9677cb0a85a4d3fd736cf3e8765a0e8229