Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40cad0d4d683f17…

MALICIOUS

PDF

100.7 KB Created: 2021-09-03 21:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69984496a73985fbdd31ba94368fca8c SHA-1: a7eb81179fe676b518b42384a87a161e48e4a068 SHA-256: b40cad0d4d683f17130c9877f578384c8b3b3ef945ac480189b166c4b3cd2ebb
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 CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://sial.pl/galeria/file/fazevajenuredepol.pdf In PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/25305356932.pdfIn PDF document text
    • http://deforma.it/userfiles/files/78978534730.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/31362003427.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jdl4664lqg3s395kr78rk1cv0s/89863299228.pdfIn PDF document text
    • http://a-pluset.com/userfiles/33961470031.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/pajedujowavujom.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/5770749127.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac238b87d5---zibusanaraluragusoxovimet.pdfIn PDF document text
    • http://bio86.fr/fichiers/jilovotasidile.pdfIn PDF document text
    • https://kenadong.com/contents//files/66489311122.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4299bef656---bujanugeses.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/laxos.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e3gpgcju4qn1364sjmfr5s4p81/pigikogevixuw.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/56355407178.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091efad67460---87041462138.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/78725623470.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8606f8cda8---21032189126.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/30357acb7d66fc78873ab377dd77068d/jubanewerumilatu.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/70954019540.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2e1d0cf7d27c0e9eb679ebc5b609b318/suxenazuluberivamu.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/37091228355.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/metexowaliv.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/61203805153.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/tofekazesedujipumupikete.pdfIn PDF document text
    • http://kd-council.com/upfile/files/83522268319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=blacksad+2+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_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 10232 bytes
SHA-256: 573d925b067e36b5135b4b57d2754f01a73c8e354d0a8d75854b4594adac6268
font_01_sfnt_off00013ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB3 19160 bytes
SHA-256: 4616b13542089db5adff8018e5e210048691e1e182ff50a031ba3386761e7ed0
font_02_sfnt_off00016cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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