Malicious PDF — malware analysis report

Static analysis result for SHA-256 217f5c66a69ac1da…

MALICIOUS

PDF

73.2 KB Created: 2021-06-30 08:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9d44eb9128c4b2b0bc39ef818ae7ff79 SHA-1: c5a97bad97b56e2c808f40c7620b74b8ac35a505 SHA-256: 217f5c66a69ac1da5ffac7cb24d35498bf9e5a03f5057bbc1ebee2757c1808eb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or spam campaign, evidenced by numerous links pointing to external websites. Several heuristics indicate these links are hosted on compromised WordPress installations or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=predicate+meaning+in+bengali PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3bb693d0e830f46ea8b414ebf94448f7/26198396155.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6hb1e9s712s9o3f7dvmbsodn97/11748052495.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/imfodpqd8rtt6k5hu6j09nij55/mibabawudozujipujape.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4039f68be1ec2675cf016cdadfbc8223/bebovopogijabiguxa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb601823e2---pedixepazazugoxez.pdfIn PDF document text
    • http://patroha.hu/file/7647739658.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/marobalebepawikozigabo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/89ee1c6c1324c3dbdac8e16972503fa2/vipuj.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/fopusubapagazibaroxedux.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b167c20dbec---84014224646.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0f752549d2d9949ad4735f19feb53686/gepido.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xugujubuziligesefuf.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/85340074457.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fb043a934---55159101466.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/limotefifididoloxe.pdfIn PDF document text
    • http://tfforming.ru/d/files/vebotajeberovuribawu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/31337356627.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/naposonubepu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd2a717c3e---lobosawepo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52844f140---fibilenapewisemizaja.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7836ab8ef---83937735986.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/popobo.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_off0000bb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 16972 bytes
SHA-256: 373cf7bdb6a9e3217ef78951492430d4347e596fd959c1984a1f545848297561
font_02_sfnt_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 10564 bytes
SHA-256: 92a42ce9acc4a5331dd3e136bca65112d6d9fed61fa3d973986f26898b953d19

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