Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bc2ba9b9c613b6…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 10:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08dacb2c0858c61bcaa599a31ecbcecb SHA-1: 4134988c865d0f7f4b7488572e94507390df9cbe SHA-256: 09bc2ba9b9c613b66553d51bdc152a12a0393c4c27f212a171dcf3472f356c61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms designed to redirect users. Heuristics indicate a link farm on disposable hosting and links pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=40khz+ultrasonic+transducer+pdf PDF link annotation
    • http://rajhansnursery.com/userfiles/file/giminekujotu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nnqf0nu12hsu3fkegscq2shmoa/57440018865.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lerorijomefusop.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/doxijopodawekalojujake.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/77763424226.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/j7q0f8mgv8kn7v3nn379ncnnvr/5615969659.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/4550835657.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/zewuvinena.pdfIn PDF document text
    • https://computerzone.pk/file/jejepifafigibobelefir.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fd0b19f2d8e8c81b7547adedaa2cc201/93094247694.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608818d343c7a---56213845716.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080abb8c024a---fitekox.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/n682u73jqjo9rd45sddtke1sb5/30606118437.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f1bec69731df29640217b6f3a6a0cb71/59646436080.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210620034239.pdfIn PDF document text
    • http://liily.jp/upload/file/20210830115429.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210610/file/23341020330.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1e43d774aa597a93630de6d4ecec4b77/wuwipufolefodowukoraxude.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/getot.pdfIn PDF document text
    • http://101balkon.ru/upload/files/28437756115.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/42314719936.pdfIn PDF document text
    • http://bulmarconsult.com/files/29048625803.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/8779367030.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/35176448158.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_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 17976 bytes
SHA-256: 6e5e816ed7480ddc31ad471fa3965381f475030949d6f840b8d7fa1180fdf4a7
font_01_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 11072 bytes
SHA-256: c013c11ccb827382d0e5fc81d0839ada94e49d28189ff562da70b38be235068b
font_02_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1