Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ada1b24652df65…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 19:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b337a9758b5861ccf8c7a46078f03fb SHA-1: 8a7ec60fe743b2a26a1c8627c9dac4b361745cc4 SHA-256: 20ada1b24652df6573a3f3d9aa8bf1ee3db7f079cf5e195ff4c576483a6a90f9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9aa1ed3cec539cbec9d65bfb66de90fd/fimibunitipesukolegonow.pdf In PDF document text
    • http://pjteam.hu/uploads/jinelajiwikuzepokubirin.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/89505172f9e375f04cbaee02472c6690/wonitisavolar.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/simep.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/892d75990013af58bdd42b13b5e63ba2/41204474712.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/sojokoxamunojufugijaf.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/35b7c3b926d8f414fb09f7652d15f5a7/sazofemulewixubinituraji.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93070dbc8---4276860447.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qq1pqd0kp580edj8iiuip1rss6/34673395040.pdfIn PDF document text
    • http://industrialdevices.in/uploads/fepalilifapaxom.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083e5a40f183---woguwupiza.pdfIn PDF document text
    • https://luminex.pl/upload/file/80497792097.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/46974844375.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/38136300500.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e90a4d2e1---topibuserefifiketejar.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/dapijutiwadowow.pdfIn PDF document text
    • https://wagaskar.com/media/72596643990.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89cdd8993b---furifosoka.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/90749123498.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/xuten.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded9b9d4b3f---zoxujifobobike.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160881abc91ae3---48885791222.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/pivcigcblcdkaedggbia1ljsg2/15137940475.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/16329330480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=causal+and+contrasting+conjunctions+worksheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012b46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B46 17788 bytes
SHA-256: 3f49e6c9cd8332ba40f164337cf93b228d68cafcdcb4c379ec0c28096a8926e0
font_00_sfnt_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 11088 bytes
SHA-256: 22eab475c8303624ac0cedad479922793b13b5f2a3f4cafeb5c2b29f63c96fed
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 16896 bytes
SHA-256: 2e86d3281498a7c55a0e4ea04fee90b5c8647822f235bf58b73be59c8f6acbef
font_02_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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