Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb5dc5a022f4815…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 13:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77102ca868055d2b4c2b62121c205527 SHA-1: 8e1b1bd2b30ed8bc292d6d53e86974a803e09ba4 SHA-256: acb5dc5a022f4815b9c466323899d3ddd25e22bc543ad3a7f5bef70b4ef112a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF-specific heuristics related to link farms and external URIs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://aradmissions.com/ci/userfiles/files/vidinidixenufidoxufagega.pdf In PDF document text
    • https://angem.fr/userfiles/file/fodesawim.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/44175593897.pdfIn PDF document text
    • https://soechi.net/userfiles/file/15645375679.pdfIn PDF document text
    • http://zapcdn.space/web/img/podborky/files/xevijujapivup.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c2f22af---nimenuwediritones.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/66326472156.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/928272656a449cc11641007febfe46bc/12830477493.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b2f40e0f0bdeae87c8b576f0b4c78caa/ruwotiluge.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/74924778702.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/tasupela.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/22319181206.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/2883816547.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/nalalanilob.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/vuvuzosoda.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210903175352.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/18781381672.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///wifagaxubitoruxitatagex.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/855572081a0f556dea8b52cab7c98d7e/soxumavarodupolozoki.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/62966285869.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/2fa561e31d07e3e5012221193d527ed3/xewanuj.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/saguzosoniwevasebodowojef.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/82633415137.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401920b4fc1---tutajokekevipitubofusaw.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/josaluselobixisuz.pdfIn PDF document text
    • http://www.bash.cl/media/file/gifuwuro.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/39619349913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mp3+video+download+karne+wala+appPDF 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_off0000bc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC69 16040 bytes
SHA-256: e0995446c5dc3d66aaa02fb7c9a70561365d31e26df057c8cc985ac20b44a14d
font_01_sfnt_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 10528 bytes
SHA-256: ce1bd226190999e9d08d09933f8d6170a91e5d74819986cde58ee1cf1197c1a4
font_02_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1