Malicious PDF — malware analysis report

Static analysis result for SHA-256 2554792da81f905f…

MALICIOUS

PDF

88.5 KB Created: 2021-09-06 00:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 586c2dcebb5167b255d42a347db80724 SHA-1: e7cf38439de43289935030736d560d1d3ccf58a3 SHA-256: 2554792da81f905f28a7d9234ee6cb0e8ae9fd3fc6f1db12c0c21cc210910bbe
156 Risk Score

Malware Insights

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

The PDF contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The presence of numerous links and the use of compromised hosting suggest a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://thaide.org/userfiles/file/9575898917.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/88eddtai1rv313tev352t5o1eq/37818926273.pdfIn PDF document text
    • https://steammining.com/userfiles/file/xidezuditu.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/folekufe.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/72815712364.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/rekoremajiwetut.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/lixelutulejolusebuvurug.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea683829a---84269290505.pdfIn PDF document text
    • http://dc-536514926e84.632.ch/ckfinder/userfiles/files/51694624124.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9k6ejm7pv204ukef83ncktdlkv/pebigofovore.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/xibamizenomimebav.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/vujuvamukesabasitemomo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd551371999---79754911212.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0nc23uarke4bn8es2gjuk1pid6/40736566779.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/tewidugudizeranidebu.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/56212332243.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210618085524.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/tegomivapopumatabu.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/30910499407.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/mogitevunov.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9ebc32f5d---27384101760.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/nokudoxijuraxapop.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a466740b---kisom.pdfIn PDF document text
    • http://deltools.com/userfiles/file/bexizipijefodafojalom.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160faaf1a90759---zevibazenotamojamovadakaf.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8c80c019be631f1297dac026d1634a8e/memevadabunogevos.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b717106e0---44949457615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=syllabus+of+uptet+2019+pdfPDF 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_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 11084 bytes
SHA-256: 297f39d624b20da3d93a812870b7a54e782d0f45a5829289c6aebeda38028c84
font_01_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 16768 bytes
SHA-256: f9b69d812efe065fc2f72d5ad1b34a3935478af09b98c20952560112beb5fbe1
font_02_sfnt_off00013c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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