Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d8276131aebee8…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 00:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42443ab4c9800f0f3a68ccbcb14743dc SHA-1: e16551ad401ee4cb5d1666b62fa56a5a62343fbb SHA-256: b4d8276131aebee8d6d99ae34958393745a89b72dbf2481a2c171932f2f051bc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://symbolfoods.com/files/file///94839215445.pdf In PDF document text
    • http://ticketsperiodico.com/galeria/files/85966687693.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/namutavudamukura.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/giledegewovuwekejowefa.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/7617844980.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/66275976481.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lng0tu8u6b5mpqqqoc86hpcan1/68731292930.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/raliwanuno.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/39949301392.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390503f3a55---48721380786.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/kegixalupimidavuz.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/pemetijokedifotikotado.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///32216360013.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/vapolowazu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/60615495388.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7202586a58ec0e151bfaa8876e5eb201/vifazoxasa.pdfIn PDF document text
    • https://manenshop.com/upload/files/52881027817.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f6c2a900da5e715ce25200e4a244ff04/6352145231.pdfIn PDF document text
    • https://produse-zilan.ro/files/tekavumaju.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fef977f283---gurolezupivelisidegeru.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/timutedika.pdfIn PDF document text
    • http://merwepizza.com/upload/file/67756076698.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/27393288847.pdfIn PDF document text
    • http://cissi.it/userfiles/files/94008364452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bluetooth+android+app+developmentPDF 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_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 15268 bytes
SHA-256: 6afdc0638757294ebb626d12d9ef12eec38ad83497ef3a7df5bf4706664f9474
font_01_sfnt_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 10708 bytes
SHA-256: e84bdfa6a5512c7fe625b2cefa437419b9605da6a84a026c693a2e31a7ff6118

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