Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1686f4cd2b4d96…

MALICIOUS

PDF

83.3 KB Created: 2021-08-24 23:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d55eeaf154f51e4dbbd481b961fc880f SHA-1: 719b7dede5327d1d4e1656e8410ac9b8cd21d258 SHA-256: ba1686f4cd2b4d966e082cb2a4985a07b3eefe7602910f988e408b6739dba285
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to manipulate search results or redirect users. The embedded JavaScript likely facilitates the redirection or execution of further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=pcr+and+dna+replication PDF link annotation
    • http://vuason.vn/upload/files/vomofiluxabufisodasivek.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/628e00e3dc86ef22382c593122d86149/rupisak.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/loburarex.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/dimiwi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7c5a5aab02ce7a055b824ad838512891/foxawurusor.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b2abc469d511523586c976fa3ab8d226/80710171691.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2591c81f3e6c6b704b8325bcdb170494/20298669955.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/943a86fd8a6c2730c427c2e0b07b9f41/zavupesax.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/xunuliziza.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609e09fd623dd---nexuvimukunorus.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/segopok.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/35883175889.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/59066586841.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/xotuliweb.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/95917705822.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc60fdf059---42639180147.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/07d150fa27d9aa69caa66ce8da6a628a/kamupunef.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/vedimavupidob.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/goxowe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/48364037959.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/53801332261.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sv22cb3lf4hq5gto2h67ns8f76/86104591745.pdfIn PDF document text
    • https://siroyensao.com/upload/files/19339813210.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/boxujojesixumagew.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/wegej.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8eb10a92b602a971767370baa128bf7b/delawekakananunumaxasa.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_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 16764 bytes
SHA-256: 2ddfad8b680a86a98de9e46186c946839f1010bcdc0289b7d29def717164eeaa
font_01_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 10340 bytes
SHA-256: 2aa51b38b2857bdc2c2f18dc8d99734e11e43621251c20d0e0ef528c6d4ca3a1
font_02_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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