Malicious PDF — malware analysis report

Static analysis result for SHA-256 547e219353473495…

MALICIOUS

PDF

73.4 KB Created: 2021-09-27 04:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 905613f45363944c3934ce371dbc4a18 SHA-1: 1bbf8b8da6b12dc2a014d8b2d90760517cdedcf0 SHA-256: 547e2193534734952fedc2b036701f875d6809eb789ac7d368b00e042e15fd11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://novsport.com/content/File/xabojegirejineru.pdf In PDF document text
    • http://studioagm.it/userfiles/files/gadofejusekituvixipuluwur.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/xidimuragu.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/nigajonozo.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/kojidilomebupepanibila.pdfIn PDF document text
    • http://stefani.cz/fck/file/67701081533.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/fogekogixalodureradaxokox.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/nozaxonogibi.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/mujavigud.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf38e46f7---limajedobezikagi.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/62692786194.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/14808951641.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/b844harcjcb5k5ehiphe1hajr7/sabifezelaxipobiwaxumoden.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zufarikovudoto.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210912203123.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/89559418743.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c030a7644---mibotinomabaxufefateke.pdfIn PDF document text
    • http://julianina.de/upload/file/jumevitepavudunifetifipu.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/36913472598.pdfIn PDF document text
    • http://mathahospital.org/userfiles/file/kofakimep.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/gukomazalu.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/51976699082.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/ropufodevowufesofeber.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/10972143161.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d5aec0e4---dikovexulibusofer.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5ae41a245fb1616ade9adfcf25bbdb03/22071630251.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/pamizigukat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=libro+de+buen+amor+english+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_off0000b927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB927 17940 bytes
SHA-256: d927f6d27412cc2ea84eff8f6115ce86596eb914a8f61b6d03bea6028c8103e8
font_01_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 11044 bytes
SHA-256: bbf50ddea05a99f2ab18929935496e2b08a8dceef3ddb41929357145e046d71e
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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