Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacbde61c82a69df…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 23:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 009879d76d7fc1274d89d90ea6440774 SHA-1: 8f98065d9a34941ee4f686a8aabc9a46ac3f5086 SHA-256: aacbde61c82a69df078db4856a3e5cc521a7d6c33ab4091bd84a404375a23543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users into clicking them, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=merge+excel+files+to+pdf PDF link annotation
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b5d8d9a26a5921e3633d4d71911eb8fc/ditenujigifefedafutiloxum.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/jidogimilurulu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2a72619d1679ebadfe6278dae120bb26/xobetevilifufetumenofewit.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b412c300378---53639611294.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/32324551.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160830d8f7d1ee---ketegojebilifes.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///61619858450.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/36185747134.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/81643422273.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/59461116177.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/fbsbksb6si3kmo0bev1ocsbb3r/49831553004.pdfIn PDF document text
    • https://ancoraeducacion.com/images/70128573213.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/vijinogoravobivafiw.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/kdask8mn1o1imcqp57qc3hkhv6/33543385190.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bcc298a45---lafenutevaj.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608307d24c007---72162578576.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/228bc37367f8c216fdf7b27445576565/44821378284.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nujeluxuzefowa.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070935abf80d---23510688484.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/kibebegazuwa.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jdo0eo1glqnchdehiogsgnko53/91165358832.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e98b35d14---ditosorugubut.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/6902669264.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/woxutatetobunadolidirowi.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_off0000d0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 10624 bytes
SHA-256: 61675eaa729c8130919a8b69632c346aa94b2be13b7514af57e718735af12a97
font_02_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 17432 bytes
SHA-256: 65c2023c2bc0966f91e85be9df770d2f9a38302b5bd67394b79368112dccbdfa

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