Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1aafa060ee34457…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 19:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43eed77c576561758363f33d1663d489 SHA-1: b6d3bd5ae82bb41dd1ad94e477847d34aa649a7c SHA-256: b1aafa060ee3445744c7d5816d4e66e2a1485f328540fe79dc2b6cabbdb5e692
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://badeluxe.com/userfiles/files/winupagugofu.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/96332403771.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/lamevugerowige.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/zozoraxibefitapod.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5095a43c---pipomimebi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/07917d7acf945e085c2e3894bc5826cc/nixexufezepabodok.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/nibemomubirozajof.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/39810960269.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/39231979277.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b019bab37ae24d05224829ff41e62b44/13402285909.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210712221359_18310287.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/85124181153.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160985529cdfb0---nokupubakajaraku.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/segugopuredezorotore.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912195985c---26695141642.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/68032809591.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/60370842027.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/siromutejadavo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/goravawetorugokuri.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/o4udgdu1p744nvujmp4h3np2h0/7534273701.pdfIn PDF document text
    • http://tw-go.org/files/42283912727.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5651f64a6e37a45b6a66d232414e1211/xifapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=latitude+longitude+worksheet+middle+schoolPDF 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_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 16948 bytes
SHA-256: bd4a7c9641e8f87c59e71f77ae2ebd3a33213d22e5862c6f0a16a98d9775b51f
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 11052 bytes
SHA-256: 324f0da5fbcfdfd1f2ce6d16632b2cd8ef6f1ccf985ca5ad1f8d4b23f75611cb
font_02_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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