Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfa40c0e548a1c7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 20:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ac59a0b725895a6fe8ab96fc5edf67a SHA-1: 194623d8de055b3a4a59fcc6d67848b59b9e0410 SHA-256: 2bfa40c0e548a1c773e1328232288d7d9c249c854757d8a11dcf942a07a86a07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve to obscure the true destination and host malicious content, aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6816083f3067eded0ed66790d8f79e8b/xavijorerikowo.pdf In PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/71629220501.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce928de266---nulitagadetotoxike.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9c4cee7558b34b0fce8980134ffb2363/68283007829.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a2ec9ba5f3c2e8fd675140e91a7a44f2/furanomiguwasower.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/73789015291.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071db1e2fdfd---4542342641.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/vituluxitowu.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/4771067583.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086125483e12---36712851831.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/nojenafup.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7133b2952---83512719997.pdfIn PDF document text
    • http://mamitobe.ru/files/file/nesamivotusasinelozeratiz.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa9fe8363---23330292855.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/98386150232.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a203c2eed85---41545638513.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f7b1a22663e520dac5849c276a9e2777/83440839894.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d45ef4a0642c63d7bad8785832f96808/begofofubapizizixefinu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a12fe57e5645b2f8c4b95b1b128ca0dd/32777922271.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/tujawag.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/wojuwogixopugokos.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/wimoduse.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/23921789392.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9570d90136fa5499a51cb4080ee32968/3473477572.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baf894e6bfa---wunaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sentiment+analysis+using+python+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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 11132 bytes
SHA-256: a8253038a27f52de39861d261e9dce84a0b9f6c8c4bfb33374bb616b3b7d1f23
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 17580 bytes
SHA-256: 279594ef07a1ed018471c558e32b9727f670592623aafb42940ad6f9bd7e3552
font_02_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1