Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dca182a7ceabd9d…

MALICIOUS

PDF

104.8 KB Created: 2021-06-20 01:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1f0a01905188840949ef08d769c46808 SHA-1: bf59810daff9038e663ddccc4018c24694fca413 SHA-256: 1dca182a7ceabd9d9bf2ab78c0a3ded6f6fcddd53d25d3edacba25c20aeb8722
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded document body, though heavily obfuscated, contains references to 'Red alert 3 piano' and 'wkhtmltopdf', likely serving as a lure to direct users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=red+alert+3+piano PDF link annotation
    • http://pwr-tech.ru/userfiles/file/lomititukobonaduwisexotup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e0ab6faa---16779797634.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f876e36b7406892a94ac7ae54077f2af/67335917310.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23d766cd0---87977898339.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e51701c99---55861286719.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/61084414753.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/to9eg157pnrosed96in6n9o7e8/ramekamobenesumujegunoz.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/82da363d251a825c6e10c75db300e271/leziwu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7156d3da2---24831871765.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa83d3df2---52321766423.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9b56ed59fc1175ffa0d8ff8528f4c32a/6768428311.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/wufitisepatofiko.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/74791024543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001435a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435A 4948 bytes
SHA-256: b337ccd94a2f19b99fa01bb447e06eb4b05caa7ae8931764c8fd00b3a94a685e
font_01_sfnt_off0001543e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543E 2920 bytes
SHA-256: 94f818d61bc9f843e0cbcaabe3707e3dcbdf56ec450153bad5f7eb2c6cd94f78
font_02_sfnt_off0001609c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609C 11132 bytes
SHA-256: 71d1c7be56f63b9fd5a1cba4ce81113feda6ff611aa263d7d640dd5b0ee7d935
font_03_sfnt_off00018689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18689 4896 bytes
SHA-256: 0439498414e7cb8149f99628290d5791d43b54cb8d1a2b6d470a6af13ea06328