Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c13394b8c14dc4…

MALICIOUS

PDF

73.5 KB Created: 2021-06-13 00:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 51a1f9bdc690b66280c5ca2110d11387 SHA-1: 11be81b5d5b5cf26e0ac8619ebf178dc01558da3 SHA-256: f6c13394b8c14dc4bc6a449c593a15246825b0d4d8d5e4bf3eb3316bfc919d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The presence of embedded URLs and the nature of the heuristics suggest it is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=bigg+boss+13+desi+tashan PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/79c6dd4cecc7ab85f1cd3f2b8322c43e/92126467462.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087713a13f29---69611260049.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/famuwijuzatipotodejomorur.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16b75773d---97110532997.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e8d494ae---18263383886.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b6134e2b4---50336620440.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/14b8682454402320580a8101826c8c66/jedolusuzupe.pdfIn PDF document text
    • http://merwepizza.com/upload/file/94738360480.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7351522c552389ac9a2fb7e25207bb1b/52112156666.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6d7eef09---tasevosunojuvuxopomajab.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mdogm7sb3flkqnfd63gq4ptk6j/kulibisal.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623565390.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd4edd5da---72316197203.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t8bc35pv00l4eof1int4rn9ep7/49595110441.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/02joundm4ctst99h6rdsfh1g0q/soxodutejeguk.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee74501e0---86010893758.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/efb54e49ea59b90adfc201e3dc889037/zefezuzuzatiromovokil.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897cf91ad69---37587842928.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/kidokax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 5364 bytes
SHA-256: 885580dd0b311ef3cb4b1586fcc67fb9561328338499644f9cd737f4c9aaca03
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 12932 bytes
SHA-256: be3043e43b671f9eae8d96f16f7858f3a32c74838cb11e6b8233c93e586300fa

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