Malicious PDF — malware analysis report

Static analysis result for SHA-256 462b3257caa59e4d…

MALICIOUS

PDF

99.3 KB Created: 2021-06-13 03:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b08f298cb45f1538299c80d7e5c36805 SHA-1: f8014213a4d7296590debc015b5df9fe4eefcd70 SHA-256: 462b3257caa59e4d72458b7d3928c4404abce38e5466294fbac51c84f9116ed3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS upload directories. The presence of embedded URLs and the nature of the link farm suggest an intent to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infrive.ru/uplcv?utm_term=wow+wotlk+fire+mage+pvp+guide PDF link annotation
    • http://gymostrov.org/gymostrov/userfiles/file/97384851979.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f85931950caac81165fff961b8e10842/kidot.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/64334642082.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/048de0cdec4223ab2d2b19baecc01bf6/mamitijet.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/peleduzexalivu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1e71e8f0---tozovapiwizux.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096485e63993---xubotev.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/70dfe63c20fc4ad86d21d5e2c4279c4c/37888663436.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3589882b1ee4d8a9bd9799b5d78cbe05/korurenodatorubujazug.pdfIn PDF document text
    • https://lecapsuledigian.it/file/misage.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/26nc8tit13reijljs1e6oob052/kunop.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4371a6dedc0aa6d085779fe766e2522a/netowemulesemuxinojusopi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e7409ffc---wibukilum.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/runokekoxone.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/012ef16d1791ebda8231b477bd46ddc4/13707837202.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/85fa095f930d55b2caa69fc6f1fd3ec6/50536117988.pdfIn PDF document text
    • http://sam-global.ch/files/file/sozikegawazibawekaz.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca3a727a0---jeviliwubakupem.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/refonobaguzadodo.pdfIn PDF document text
    • http://******************/Wotlktalents3...00000000000000In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A77 5188 bytes
SHA-256: c1350c2d08cc2457c6b6062cc21ec2dba1e769df1cd0e96bee041a07fc586630
font_01_sfnt_off00013c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 16948 bytes
SHA-256: 56942fcae0c37f779ba974487cd68775c0cd97bded217c78362baa9f8d952d5d
font_02_sfnt_off0001701c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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