Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6275e64aff20c99…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 01:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6bea2176fefafb3f250f2b0f187c3bc SHA-1: 407b5a26d84de38ee7ece3988053bcc693bde103 SHA-256: a6275e64aff20c99801e656e7a7ebafbada804691426b4a02395dfef553b2e7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, suggesting it's designed to redirect users to malicious websites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious intent to lure users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://irlanc.ru/uplcv?utm_term=sounds+animals+make+worksheet PDF link annotation
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/suzap.pdfIn PDF document text
    • https://artbynela.com/uploads/file/lixivikifulimusuwapud.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c40790e8810---69909437844.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/5701391239.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/39121646931.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837e8d854cf---24170907177.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0a122e56c011fc367771f0219a42b8ab/60254090091.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d309f6f8---zobumu.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/59538608267.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/rilenosodaxavubudaw.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/ridukaj.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e4255406---71758464245.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/96630676915.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/siwamewadasar.pdfIn PDF document text
    • http://apvn.info/userfiles/file/voluritopuzomefaguwutavo.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/64517461652.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106280629198863.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/sazifuwanojajejaxesad.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d74371ca3ddc9032b39af02b42a8b75f/11424227878.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/17261337298.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/19169559499.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/46a840e5603034de4222a2737b650e1c/numutegisal.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4f888b950169dbfce3e1b1bec4f77249/zaratumajepa.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/90264de983a04e5a4b867676fabae909/54128124528.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bd9c16609c105c5cc4d0f7da6da69e2d/dumuwunevuwesebuneku.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/30110101012.pdfIn PDF document text
    • http://delve-cr.com/uploads/21250879652.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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 10868 bytes
SHA-256: dd604b1bc3c0327e21809a738f4dd295ac6c46b39640f51cae992465b4c1096c
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 17172 bytes
SHA-256: f55f3ed153a10c0943f2a4fa088b0ab36733adebc7ad1eca7a55f3f4cb56a3e9
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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