Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e2ea0c3a9caef7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 16:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da63838bb8baef0957844670a5c3a38e SHA-1: 99c66bb6d78e0e37bdb8000b72b93030f72cf83c SHA-256: b3e2ea0c3a9caef7d2fc7eb636ed35fc31a2097f29a059df28695d97743c5e45
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised WordPress sites. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=hd+woofer+led+price+in+pakistan PDF link annotation
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/39995584772.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/18865175770.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/0bo3r91u6sngu72fpntareri9v/7311247647.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/18765900308.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bowokeweredete.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zojunuziwumobidiwux.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/ed9b86deb47b508ffe59d31414cbd3c5/xadudesegovujotunefekun.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/juvobavem.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/23638426903.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e78e87cd51c8bb595681531517216724/16047934171.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ba7456fca022061570a8631c45646f90/dumovojonemiwomu.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///jegoxerugo.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/17931618833.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/mojazeni.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/fonuwafenum.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/11359142751.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/zorali.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/89279553708.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/7693401636.pdfIn PDF document text
    • http://hotechike.com/files/files/vojedo.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/69524863684.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lubedizudubebururudux.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/gosaso.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///23395664554.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_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 10784 bytes
SHA-256: 6cd5c3ca1ddb81a6521faf41675bbd64318339af7d8e0b64c5729a8b8b25d079
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 18040 bytes
SHA-256: 7f3d8ca83e995f921863abcb512ea7407a005b98db16b5ae947532cf5a699ca8