Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8f8acb6262117f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 15:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3340321386aa66045db01f3fb90cb8a SHA-1: feae36e55d7b37d53cfc9c93d9be8c9ad337ccf6 SHA-256: ea8f8acb6262117f7834b9b85a39f01f26d71c0fff7541782f6c2bcfc1d4f20b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, and a specific URL with a 'utm_term' parameter suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=game+space+apk PDF link annotation
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d72badae739669f042594abadd1a33dd/13879466161.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/64258274475.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/7151258484.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45144333562.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/pevibepi.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/nojenafujigamunol.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/65697457129.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130387be2339---zilesebimixotetuguxowa.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/pexan.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e892ef5a---juwijafoluzevufemuxu.pdfIn PDF document text
    • http://orenprom.com/img/account/file/26534648224.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133436f72a3f---53025582377.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/fitiladereregosiga.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/14972897796.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/sowak.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/murudotarisepukuli.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/vovuzogiruvovirirewos.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/59137318178.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8679a9f9cb8fcce3ff4be85e9dd8bc74/44681776204.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1ecd0a64---xisejuxenalezu.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/58477850095.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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 17748 bytes
SHA-256: b4da3a1f2ada0b3b275bc9c5626ab182360c196c5b34f855c28a3f9155aa0ffd
font_02_sfnt_off00012842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12842 10108 bytes
SHA-256: 1cb6b53c5eea6a83533e2810c3072f11e101202cd30f309809c2b3cf404b6698

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