Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d5437e1ab8e2e0…

MALICIOUS

PDF

85.6 KB Created: 2021-07-25 00:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0640e6fb76696f48a33a0a019145af21 SHA-1: 2a8ffb3f3a81ab8009eeedd16fbe848ef449fcce SHA-256: d5d5437e1ab8e2e0f43afb41af44f9dab6b8f6022f5a7ea64e56cc7b3d99b4d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nguurbnahdvhm3fjr6rro7qogf/1214340228.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9358a8aa42839708b0f4700cb124d573/37997118887.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/84aodmeuk51uhppho56e5h0aba/87756852801.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/c3mcsqdpq6h3ud2u1ki0992rc7/98458620860.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa3b32b41---xadajesojeve.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/jigaxalurarodesenirazine.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d3aadca6d---31821254010.pdfIn PDF document text
    • http://tfforming.ru/d/files/75405516051.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a240be74---tivar.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/dusanes.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/15250815702.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/78059914170.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/31393879006.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/gafiroxero.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/fatomobafuramanubitusi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/19aa9daghpld3odtdul4vuqo0o/gakuboxutivuvutidosorovi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607300739723b---jimiziw.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075691871c91---ralugogadebupexet.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/tejeg.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/tufijasen.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/14785884619.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af297bc3566---gisukofejikurefobisizadeb.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/welifagaradi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2623b576c---2471218543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tp+link+access+point+drops+connectionPDF 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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 17072 bytes
SHA-256: 84465be62e7bfda0eeb1d9772752baa0e7ff91554965bfed34b086bbef8fe24f
font_02_sfnt_off000130e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 10564 bytes
SHA-256: a35357a4f7f9100c4f9f1c86e62ed2f956771cbf1ad015116b6dbe14af14741a

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