Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ba1dcdbcada834…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 21:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2fc3d05f1ea546fca6c5e1811913bb9 SHA-1: 4db1a8759e2619579bf6d6de2232e770476f3943 SHA-256: 83ba1dcdbcada83477fa516804c1ddc0b707ab61e2267904a3fad8f2b04b7089
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files, a common tactic for creating link farms to distribute malicious content or phish for credentials. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics, along with the ClamAV detection, strongly indicate malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://syntra.pl/userfiles/file/melonokakufiwojabigakes.pdf In PDF document text
    • http://sicilalluminio.it/userfiles/files/59465439586.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/fexawajetejanajevigul.pdfIn PDF document text
    • http://quinta.cl/upload/files/wawajazi.pdfIn PDF document text
    • https://jin-ji.com/upload/files/93000610032.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/66790225988.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/90270845330.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210907_020516_193.pdfIn PDF document text
    • http://skene.es/userfiles/file/kuxisopupetuxu.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/57044584500.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/19714150138.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0ccad56f---77168142221.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/gubelewakifi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/49191001044.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4qftpft53v8qss8eg0rldcq5c7/wevijenudogexitiwape.pdfIn PDF document text
    • http://bankerz.in/qpic/files/20317452511.pdfIn PDF document text
    • http://cecev.com/stockages/files/mifotu.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/nakevexokovifit.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614227eec95de---93787553591.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece77ad28c---92430092869.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/piwaruxilifokowakegapiret.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614708b4c7e77---80818860506.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/09afadfe5d4f5cf76a769f4caaf126cc/97252702359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=poco+x3+nfc+miui+12.5+downloadPDF 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_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 18312 bytes
SHA-256: 77aab41272dc337e3148a9049eb4907acb0709590c0c4d9dec8f740f81912f6f
font_02_sfnt_off00013927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 10972 bytes
SHA-256: 8fc7951d9e517fd4aad2b7bc175644764b2b5a9f05adb4fdfa6b6dd1edfcbba7

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