Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa4885ea6b43a16…

MALICIOUS

PDF

68.6 KB Created: 2021-09-21 01:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1cf81462898bef3c8294c9776c1866de SHA-1: 5419f17ea0b9f0f6d5a43e155e90215b4d01414a SHA-256: caa4885ea6b43a16b1fc2814dde1c249446f15128bdb46178da6f1e256059cf2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure with an image-based screenshot and embedded links. The heuristics indicate it's part of a link farm hosted on compromised WordPress sites and disposable domains, aiming to redirect users to potentially malicious content. The primary URL, https://coretry.ru/uplcv?utm_term=view+private+instagram+no+human+verification, suggests a lure related to social media account access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=view+private+instagram+no+human+verification PDF link annotation
    • http://knupress.com/pds/editor/file/bideweximijir.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/69315410448.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140802996091---xesajanirezulesavamo.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/36260528458.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/rasorovovidu.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/durumibapapu.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/17941611878.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/gagekewonorilugug.pdfIn PDF document text
    • http://lex.tj/img/file/45921544519.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/90316367942.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/dawefokibododonumaxov.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/38805215714.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc2929d04---80882833342.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/todutijebosulovekowi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e87847c5d2c33709a7f4da8597048226/lomovoxiza.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/xiwobigukuv.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/5377308075.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161318c4e44f66---rajonoxebaxem.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/gowojigomefalemiwibirozer.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/juxujebegixofomubilutel.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/62358828968.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/xavifidufisetakopufuzepe.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_off0000b0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A1 13904 bytes
SHA-256: 6cb3ed0ce62a92eacada91926faa6725cc9d3499ccb33cce62a0123c56d5f47c
font_01_sfnt_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 11104 bytes
SHA-256: d2a2326588b7b7c779108978d34007d7b769981141ff6a84859e306d83d09eb7

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