Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46e3e3cd1174ea5…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 19:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0fb59f057c2911fcce5b8ccb29dc8d37 SHA-1: 8a76f61290033d5a3f2b13751b05c426a833103b SHA-256: b46e3e3cd1174ea5c572f83f67563ce60bc4d6ce051c709a9cfd13c24e6f9c74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm that redirects to other PDF files hosted on compromised WordPress sites, a common technique for distributing phishing lures or malware. The presence of external URIs and link farms on disposable or compromised hosting indicates a malicious intent to obscure the final payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://totoumi.jp/upload/file/25723326439.pdf In PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/70960908522.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/67171166803.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iahinv1uhcd4nvl7vcka250o17/4874855242.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/50637321159.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf8d5598f---55003868777.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088c1eb9220a---57624705609.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/xoraxujaditawoxa.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/52902299502.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/dotegife.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf1cb90739---temixulejulo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf3e4c55a---wenotiw.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/nuzuwo.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/kotiwirijobo.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/56095239282.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073917254a33---16417721530.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bffb15595---paxakolukisumuz.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/desagagezumixejalijapiru.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a954b0d6129---jetadijexotewadosegeza.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d4875b4074e32e8f0a5ec1001cc4428b/wegewegikikoruzex.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/42823315684.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/84150975034.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7475450e9c---pefip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dance+of+the+sugar+plum+fairy+piano+duet+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_off0000bd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD06 17056 bytes
SHA-256: b232fe92e34026dd0803b7ebafcdfdb33d50ac56fc56cfaad54ce27101037b60
font_01_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 11280 bytes
SHA-256: e6747b903c57a6f4904789250c8a050e434a45d2fffbbe22b7939461c29be9c5

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