Malicious PDF — malware analysis report

Static analysis result for SHA-256 270115de7aa5845b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-12 10:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 751fe24db5de24819efd5ea7050cafc4 SHA-1: 12541476ee08031314eee7dcd32721113be16285 SHA-256: 270115de7aa5845bbdeafc5628710361a19a8ebf4a5b1241ad2d2b6d1588b933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable or suspicious domains. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613171b73cdc0---tonomiga.pdf In PDF document text
    • http://shahnawazonline.com/uploads/files/68639931761.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391ba24553b---tavadapariteliwe.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/57549686744.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_EDCBE25884542424.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/matojukenomalewapegi.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/gobojemowomozo.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_0D3B0210CC65CC8E.pdfIn PDF document text
    • http://foxadv.net/file/lomusupozikikifoxubifolun.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/50825175762.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/67772863943.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/38149589729.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/jabuk.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/51683180856.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/12563423740.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/75559833994.pdfIn PDF document text
    • https://mfdesign.hu/files/file/25339119978.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/40138841857.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/91770351887.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/52110737987.pdfIn PDF document text
    • http://1careglobal.com/upload/files/1759205863.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/66607784764.pdfIn PDF document text
    • http://ausafe.net/images/art/files/49506180466.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ace04df1---juvonufijare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=in+on+at+exercises+pdfPDF 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_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 10620 bytes
SHA-256: 854a92f4178815df4f9b4107caa9f0a85e3424ac3caeb853c1a2fff915d7dd8b
font_01_sfnt_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 16552 bytes
SHA-256: 339d5b70a67c34e8fec4c3f83f0cb606f6169c76544d5e047b0ef7a0f9eded4c
font_02_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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