Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8e16b9f593ef9e…

MALICIOUS

PDF

93.2 KB Created: 2021-07-23 03:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 104c23399245fd00971aa714773114da SHA-1: 516ef03ecb4651eb8db345938edb6d49e427b6eb SHA-256: 0b8e16b9f593ef9e8997b5c7560db5187bcde81272caa3bab41c835a742f9429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised CMS upload directories and disposable hosting, suggesting it's used to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://aimara-bg.com/userfiles/file/fafapebujuvatepoxejuxoteb.pdf In PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a596828cb2---kesiwezebosufagikubuku.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/p4kmktdt6s0r81amaqkb606eq3/seropozuzisorarisapusif.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c1a00a74edb0aa8f8a83bc8f4b510947/sowusuritevipit.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3318f3f2---xufifobefujisaxoketulod.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/59313947260.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/45681934459.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b8451f981---44260704405.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bb6c852a1ba047adffb3a8aed43b8670/93401416609.pdfIn PDF document text
    • http://sushibelovo.ru/files/tuvotapufezej.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/bamofuxugufafasotipesas.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4c4a067d8637a08618f4abde4e70393e/5624224707.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/denefowobuvijabof.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/935d0e641b63ad7f74cdb2260e86c1cc/sunokewapodada.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfaa56824---5874517039.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/3480927246.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/kenuxukama.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/45847144142.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f031d092d---nakoxesukalakuviro.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/xuvasipafevitogoritesulur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=percy+jackson+and+the+lightning+thief+authorPDF 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_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 11192 bytes
SHA-256: b57dd09ffb59eef7f7d188007e6b7a4971ed1da67897cbdead521dfe1b82237f
font_02_sfnt_off000136a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A9 18072 bytes
SHA-256: 665e307d7eb5ea0cbb086922fbe4cdc0db5e366922c1b6293c082d65fd9efb7f

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