Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3ada4408cf3a59…

MALICIOUS

PDF

103.9 KB Created: 2021-06-30 09:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a0007da9a313e7677dd99f4fdb24f0af SHA-1: f24803b21b076fce1d7f11240b2ae175b3e7c606 SHA-256: 2b3ada4408cf3a591d11e7bcbfe7eec54a5a8f9b8e26b9ee86d50f00ae322956
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term_redirector=True' further indicates a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://crewmak.ru/uplcv?utm_term=surnames+beginning+with+w PDF link annotation
    • https://securityguardsupply.org/php/uploads/file/xemaxisupusotalozo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b976c2dd570---67704973293.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/54638970351.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/5052212616.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82d7c5fc69---jedofug.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/20898883140.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3305edbc0---93149321098.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b4e41fbb6958c0fd1fa6c2a4fa65c599/37933452562.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9ced44ef---6946636744.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1aa81d7229---milunogituzilujusolo.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e9ec06cf6095253f79883d98b04686cf/23128274226.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/limesexo.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6bd443fef0f93f42ce1e99e8e243b40a/rizizezufetopido.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/v5orsf44fgb1q3116u7t1skunr/begiwajilamed.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/aa368fdf5f1133feec93668639cb2e9f/kolirej.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607025950c5a0---vidimi.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/24742094604.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f90b7285---nulujoger.pdfIn PDF document text
    • http://renovator.cz/files/file/magefozovanipozaza.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/sesizigaloxojosaxipoko.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/nikume.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b95e2c207---35033248300.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25af28f9c2---21732347980.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/xomixetu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a53bad671---56775698849.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_off00013348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 17012 bytes
SHA-256: e0bde14d6d52e956f464c26c5bc5baf0b19d60703f28acd06b9fdd73c65aac98
font_01_sfnt_off00015fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD3 10792 bytes
SHA-256: c0cea2e87d33024134123efe8f570d169812cfa7ccb3f44d88040015c56de6a3
font_02_sfnt_off0001788c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1788C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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