Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cf90a7ce85c7d7…

MALICIOUS

PDF

88.0 KB Created: 2021-07-10 03:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cd014d29a46c754fd1104330eba5b3d7 SHA-1: 0d4ce54888e33abb5cca4813ece5971c67a768f2 SHA-256: 19cf90a7ce85c7d7819b1997794c1b9d46ea9e97dc2a47bef9b46ad82716c0c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing or trojan PDF. The embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/31ba79b6fdbb2a10dd148d11954c0283/makanavevobipedad.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/5bd29c20f4c695d954742aaa8f717b77/winowaxajomirevomupek.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/okkbv7l48d95bsl3guutiolm5c/46046582955.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/28712118089.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/95932935939.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/75602079231.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105020824244476.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/22003541238.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/woxesalufikaminaxoruvuje.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/mibamejeduzunobe.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082161baab45---96906540005.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/danegu.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wenitev.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/67317839288.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ecfb9a8f2---95119736393.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/30029941625.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zawavowuduniz.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/pofamunutu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/32962650511fdeb50c7ef9575d0c65da/42438703343.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08c66f072---dirogowun.pdfIn PDF document text
    • https://strechybenesov.cz/content/31458429506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=money+and+banking+notes+pdfPDF 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_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 17088 bytes
SHA-256: dab03f1f7de205983c56ea612942ab4f8c783f54b7d942534a7a8ec08ab04956
font_01_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A08 10864 bytes
SHA-256: 99ffcece6304f275517b4d344fd624743085d540d54291d2b65608a7cc740653

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