Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f87429205bcabcb…

MALICIOUS

PDF

81.7 KB Created: 2021-08-17 07:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6051b866a1c5b6d68f215627189002b2 SHA-1: c60294aaeb289a557709fb62a1b7d0a0393b060c SHA-256: 1f87429205bcabcbc3740e939887d25f1d87e753d825adb5fb77b26875a44a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

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://huntic.ru/uplcv?utm_term=help+with+amazon+fire+stick+remote PDF link annotation
    • https://pmms-online.com/assets/file/38330710614.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216131931599.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e10be53500a---sirukunedopumifi.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vemumojakotebezulajun.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b9b0ed905f797e70da058eac092f2a17/vinowatixelofuzuvuri.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/73a5ffa290559fc7dd6d7c332024ffbc/fonumavodugi.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/6073926372.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9incpi1v665o4cd2i5n92206pe/vuvotorekujosa.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/9fefb0udr3g7dc1c3fu18ubggc/pidaxudekajefido.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/xiwibewivexodiketir.pdfIn PDF document text
    • http://ausafe.net/images/art/files/dolazeb.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/45404011188.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bd8ec6ac---nelezopiv.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/bewugutowinat.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609080f4e9728---84899997745.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/vagawetegubinedasa.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/73cb2a75d64954a89e373cdd110099d0/495167856.pdfIn PDF document text
    • http://maksimetall.ru/files/sejatofawixino.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e856e2839---2165300848.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/xebogezejibefosogubemavi.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85893528903.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e48b30ae---pasawew.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/pubuvolad.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5242239c9cdd4f4e571c41e5faef0260/71111769632.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/38801372737.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_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 10976 bytes
SHA-256: 9dec4eac9aa8cfe1436d8616c09f9682fcd29b4ef50c572d355755602ec4f1f0
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16840 bytes
SHA-256: 0f0d1d32888e631648f47e118ed2d0dfb61947bdeaaeb975e1b00800601d3984
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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