Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23ef9bcfe9d63d1…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 00:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a84b9b0ee41a9e4e161164aa9f0befea SHA-1: 92ab98d3b3b271bac6c14c1503f085b567a9d03e SHA-256: b23ef9bcfe9d63d1d3f1e0e71ce7ee2b42e8719f2ebf3a8463764dc081488454
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are identified as part of a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple links suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mcenterdk.ru/fck_editor_files/files/85074733184.pdf In PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/berudinudewi.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/paxotuzilibag.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/20335076725.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/14801a31816a0ba99bfc7667bd097bba/dozumixixuzed.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/lamixokololivafa.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/venizugun.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/bimeputupafimixagilagixo.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/zegugekomanil.pdfIn PDF document text
    • http://annabarons.com/files/files/pulijozinigo.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujevur.pdfIn PDF document text
    • http://ternovykh.ru/content/file/domotarikegos.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/48293986176.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/64091557573.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/36983079444.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/gusarofusiwaxov.pdfIn PDF document text
    • http://camonetinternational.com/files/file/47924521128.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/zinufuwidosujodas.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa49ed400---21322130074.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/fexiwigofizegozanadere.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd0079d4c---fapezuwaketowajuzejix.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/mituvitoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=work+profile+apkPDF 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_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 17052 bytes
SHA-256: 0c48a1bc81786d870352df10a367744c08e3f6f8a5be244339904b0743d77a76
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 10068 bytes
SHA-256: fe2c62f4126e1d50c0338706b29a763db9fdafd669a240b7545cf6e61a9802b5