Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaa0ebc22ebbe24…

MALICIOUS

PDF

87.9 KB Created: 2021-07-09 12:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9b8af47a54dbb975be119fb66c0316b1 SHA-1: 5f69bee1a79154ec5ffb22dd5e2172b40f8aee6a SHA-256: 1aaa0ebc22ebbe241e2dcb57b294e2572ff221f7a6e660c6a20bcd90c63191a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b5af367c4---gulekadanegugu.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b372871d70---nekiboju.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/debimebolabe.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/67191455990.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d43b3368d5---rojalamubapijogukitanu.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/69029994770.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/jnj8v0cobsne167hqri9a9djd1/nomapenuduvoravemoji.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/30969984530.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160847ba0777f2---92202242497.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/47429737306.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/47671363283.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9f3b96dc38559017c8d8d662f202704f/91665254678.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/24295243539.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/61589544294.pdfIn PDF document text
    • https://loctra.net/userfiles/file/14507065488.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/34873933731.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e28906e5b9b---rixubewukasibam.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/81845572995.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/tq1hnque6pv8qr5hk51dcmfdfd/faxezililonijebibiwuwi.pdfIn PDF document text
    • http://zubrcup.by/files/files/tuzifofegukitupakabida.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/15c36fcc9f5efdcc66977716c919b1bf/nozawejofinilisokurivon.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608958bbbb8db---kozomupap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=french+plait+side+of+headPDF link annotation
    • 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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 16712 bytes
SHA-256: 2f1158427b2d0f56aab203e5c8960763e7e1d7aa57ba7ed5e2666ba8c8b0910b
font_01_sfnt_off00012210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A27 10692 bytes
SHA-256: f5e249b9fb924957b51aa0b7019527b024815b6dec76a0ecfdfa8d22b184caa5

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