Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53046d4407e4d6b…

MALICIOUS

PDF

124.3 KB Created: 2021-08-31 00:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 633d698b3a2fde4764d02bff5eae65bb SHA-1: b8440c56cf81d55d380e0a4d41ce5739c9059914 SHA-256: d53046d4407e4d6bc9704ad021a49000436c547cf19c6a3f04b74c2924061a53
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which host further PDF files, suggesting a phishing or malware distribution scheme. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/42bc3f76669d47a3e53368ab680fff6d/bomowilesamexixiwewovisu.pdf In PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/50f562fc2d3ac0d453ccf834a6abe46e/97502213549.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/xupuk.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/85736655497.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcdf6f32ba---dubatozim.pdfIn PDF document text
    • https://btegypt.comfile/96955792557.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d3f9cf9f---64061457109.pdfIn PDF document text
    • http://someteme.com/archivos/_20210815234939.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb4e270ae654361bdaf659236c68fb2a/60165693279.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/37220145443.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca53526d65---xomezusajumovow.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/lowefedeginitasedakoruj.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb4da1da8---tokisubigi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161202702c0e18---52538448462.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098877dca483---dapavobibupugufomokutu.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/bukedib.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d517aae42c---gakirifivovudifowezuwesem.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/62608621219.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127aac930451---nenow.pdfIn PDF document text
    • http://shahgrp.com/uploads/63501372603.pdfIn PDF document text
    • http://mousike.it/img_ins/files/52491548644.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/91665940534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=reconciliation+meaning+in+biblePDF 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_off00018180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18180 19564 bytes
SHA-256: 004fb5e234ee8218d85d49b867c51b9ca8147946f37a4d42f72288a1793df08c
font_01_sfnt_off0001b393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B393 10492 bytes
SHA-256: f5246640268f67c69310c31e5b65f3d5301b965b56dffbacd104d90485b9b4a9
font_02_sfnt_off0001cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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