Malicious PDF — malware analysis report

Static analysis result for SHA-256 921e96094c8df4bc…

MALICIOUS

PDF

96.4 KB Created: 2021-07-21 04:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 54c6bbaea8967781ac0d2fda5720c579 SHA-1: dcd91d94a615d236b63d1503f55f9101c0ae434a SHA-256: 921e96094c8df4bc7ba5402d9b846bb828b3eb4eaadd9d2687c5e008a416e50c
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 a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e7e0c75fc01c4181a787913affb3d6a4/tabefewofexuverazinivakal.pdf In PDF document text
    • https://aterhesseg.com/up_image/file/vafoxire.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b8bf4b024---gorute.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607754ef69435---21912031968.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1c5207f5---24900291184.pdfIn PDF document text
    • http://byecook.com/ckupload/files/tiwegarekevojumofepufuti.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b0a5f503a5531d7c5efc74206f1dd0cc/mofepimavinobujuroke.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5b71f63826de3520f8a7c7dc0b997ec7/nexapapenibok.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/55105996208.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/pupejelisumidazuzof.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/97691459785.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/90934523392.pdfIn PDF document text
    • http://canvangdientu.com/images/file/xetawifuli.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/evq61jd02soq0ln54dukp6qsf4/91014110928.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/36222635326.pdfIn PDF document text
    • http://abpaluso.com/upload/file/fajonadunaruguk.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/174f04b73c2f1cc99995b5f8ecd01cb0/70131678250.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5f19b69f721ba84c725276f0c50adbdd/24333526010.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51031117566.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fisadejiraxasabofa.pdfIn PDF document text
    • http://ubest.ru/images/file/puralivutogo.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be38c4bc4dc---pafevixasidosazaj.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608042dc3d271---miwafosobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=speech+therapy+after+intubationPDF 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_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 17624 bytes
SHA-256: 2d7d5705ac91c21033f0e6683d304e2eb5ec8500010ca0034fd7659dc0d0b078
font_01_sfnt_off000143e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFB 10792 bytes
SHA-256: a4383419a76993b6ce9bddd12b581af9ee28ba00077651c8442d203cb0651dcb

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