Malicious PDF — malware analysis report

Static analysis result for SHA-256 5797f47cce7b222f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 22:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a31f35f1c965fce12c88a01dd3823171 SHA-1: b74d5948f4bc683b473a99fe05890c43440f7cbd SHA-256: 5797f47cce7b222f9f953b78e8de4899151aee49aec1b09e1433d4638842a4ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1763edab5---5217899101.pdf In PDF document text
    • http://vswet.ru/f/83433060062.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/muresowoxe.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/derelosifegimoz.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/gororikudufotemop.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/lugawitut.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/jelabodidafixovipawozilam.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091912120968.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149535e35987---22393712670.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/84711503906.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446f6bb372---95841929432.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/4677553625.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161472c36bad14---73023135218.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/30192070991.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/863e430f8b069dc22ed290ded409248e/pizaz.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27791914693.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/miniximogapuwujokotumoz.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/55182713313.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/38485990241.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/kifuxe.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34919525066.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/judidizebuxirewovutimi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zoteruxewuzijagifiguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=balsa+wood+truss+bridgePDF 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_off0000b503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB503 10700 bytes
SHA-256: dc283194a05380357ebefc03170ab32e5bde1ff9df57f765b20c4a2001d99e55
font_01_sfnt_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 16960 bytes
SHA-256: 5a4cd4f6a298eb116d4117a2cb1f2250e846015cb00e9eeb3850e361a1c76acd
font_02_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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