Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8b8e044966389f…

MALICIOUS

PDF

89.6 KB Created: 2021-06-30 22:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0545b2dcc57696931cdcb9648cbac300 SHA-1: 19898fd628d84f10b3f1e86beea45f9d0ca73a94 SHA-256: fe8b8e044966389fc36cbb6363b8c18439d58af9e120498a774e4e07e51e730c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075523b9c48c---26578611413.pdf In PDF document text
    • http://robalton.es/Albums/images/file///rikoxerijam.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/35137497073.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d663d481---85392183319.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dopidokizupevow.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/1rck1d2ffn8taou7b4jecdj1lb/95278598617.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uuph0d882fgm40lncm1d1lekms/doteluxifamazojafu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/64e411c5adcee0f716e8a76a29560ba9/mitupogirekozowelebodoz.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/38846856542.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/84fbde3a4ca00c56b546009f5a379b70/38257016086.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a3f224a1e2ad217a55a5bf9b60caae3c/kukoladozunow.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6abe77dd1---levedugu.pdfIn PDF document text
    • http://usagimatur.com/files/others/jetiwunubobireg.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/16965369448.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/91103370158.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c6ccedbe---lafurezozejijiwig.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536f8ae39d---69343927809.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac739e14671---51082140068.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bab78e46f60---furobuzisog.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/jakijapikigadubanu.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16225533791806183898.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8b53ea7e---sipuzazawajorawonor.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc2d008eb---toxitisegapinibugon.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/7ff557b539a02105dbad28273d28374d/65595027658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=growing+petunias+in+containersPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/42b3a62b6b1aeb104275bc52606fa3ab/60942009865.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_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 10728 bytes
SHA-256: 3ec3020ee863fa1516ef34b6b7916eba681ceb551aa676b90d7b193e6cca1ec0
font_02_sfnt_off00012e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 16432 bytes
SHA-256: 502003469cc95338081983ed3a3a4b6c1aa9026286f429e08d40a99a1c959788