Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede081e1b134a6b8…

MALICIOUS

PDF

94.8 KB Created: 2021-07-18 13:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6fe8965549f482ccd4c9630147296338 SHA-1: c30f5bd60ef787882c5675810231879c8cc45bc7 SHA-256: ede081e1b134a6b8b00860d0fe637db231dc7731a2c377d49f537cabe3182cfc
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of these links indicate it's likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a04945ceb---9124763242.pdf In PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/d7088c4c09e5caa9f588c06c9711bbdb/74883173263.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/15402148430.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/14381267237.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2fa13f1f2c24c50f2e596a3982c26571/daxibodisowufewoge.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/vinenixowevamurusagibafo.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/tujdjj5q5pe63m2fbpggrsiltr/fifugulewijajotonunaxijit.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094662610569---1941044870.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/ruxawamisewemujapajutulo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/dd7e2db8ed9a91680adc99663c803d5a/93415132828.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/88112980158.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1cf88bdfbd0996991663ca8741362ca6/mimolat.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7c8bd51afe5a1f01bcae9d0a8b8760ac/21030377761.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/wonogelidipogu.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/24219954600.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f33c78bce---pagajadepamegobo.pdfIn PDF document text
    • https://domilot.com/uploader/files/raborobakawiro.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/sejopuvuviwopufadape.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/bewivenupijedukene.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/5349525306.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u5788ec6slecf1ur4oa7j0kskk/96133446030.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bceb52122d---73632165982.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/gisav.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/pogewisonemugavedake.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/1063725936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=paper+theory+patternsPDF 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_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 10324 bytes
SHA-256: 36445ab9d6ca6384bd598a912d2aff4d9284b2d15b3b460ca8a15f36a3bd0138
font_01_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA3 18156 bytes
SHA-256: 36003948a8ad0730254444adb3148dc4e194f3950015f95af1df76bba22365eb