Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1378cfc096684c8…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 21:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 696c58f7eeb05ef37974343d29cbb543 SHA-1: e8a1880b6bdac4b5feb463a8e77b0baa33387bb9 SHA-256: d1378cfc096684c8a7482a12f033d55305f4b652b11a38d34278e55beb51f258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's intended to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://robert-zauer.cz/userfiles/file/tusunugibi.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e58b1e21ee0abf78edad74c3b48aa6e0/mokiruxogesixatexujusime.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/pabajefeder.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d7db60421be16ab883b60165184f9fd3/20875171729.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/tavobanojerirukutanoduza.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/76388891474.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210710_082827_125.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/suvasofezovowo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/7235f00b855e7810ca570b776ed461f5/jefifojedinot.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdf40356f1---lugipavubovazobepatese.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091a5134524c---juwososotapidon.pdfIn PDF document text
    • https://andana.us/files/files/96092124261.pdfIn PDF document text
    • https://irrisyst.eu/files/file/94797561111.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/42783730910.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/luxekukanil.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ac1bf8efbb01aa96fa60e12ba8de82e/remuvawafuko.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/vadojasipalerago.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084a30e51f6c---43561460215.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a7svdke1irlcrflfqd7qe5o7q7/jibib.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/zasora.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/8162602315.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a2d3e224---tuleralofavuter.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2435d5cc0---85899775086.pdfIn PDF document text
    • http://saglikligencler.org/files/files/305278990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=singular+and+plural+worksheets+grade+4PDF 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
font_00_sfnt_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 21664 bytes
SHA-256: dc8211fe0c5564200a2f771f0470fea9448a2093571dd4e816ac86065176b517
font_02_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 11104 bytes
SHA-256: e30556514fde03d0f28b8c96dad80d4881d3181b65af29a8c96ed77e725f5bf3
font_03_sfnt_off000143dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DD 16444 bytes
SHA-256: 23b39485de309596148c0a09796f419f39406f144efebdc4dde42d44a2348d5d

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