Malicious PDF — malware analysis report

Static analysis result for SHA-256 5893fbe572c2f3ec…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 01:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d29aecfde7c06d81ebbb095fa49054e SHA-1: c72f959d9d02912e411c6f7212aa95021dd07411 SHA-256: 5893fbe572c2f3ecce26955a78571e6fa5064c8a23913a4a9fc61418e783bb3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common vector for malicious activity. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress upload directories. This suggests an attempt to disguise malicious links or host malicious content on seemingly legitimate but compromised infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7a381c63ece717b6ecba173d80736a9d/pofulajisilakirofibupanab.pdf In PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/zovufugisutin.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/kezuzizugek.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/n4lveok0up7mlhdp78pu8771f1/sebalibutegopobojubosivat.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/28148525780.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/87758133317.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/belir.pdfIn PDF document text
    • https://emenu.hu/editor_up/novixuperonise.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/sodetusotiwuvijan.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612177563061a---11957570079.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ee5f12948---bowabobenupodajijusu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa6f769c4---85511008062.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/793erhdjbj7unqljpb6nj089k2/90126542916.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fbcdb85c7---dubivurarejebipotalid.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f781e1a95---71298363115.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/65014021422.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b33ab0a78---86992523976.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711274cde0c---12309629034.pdfIn PDF document text
    • https://wita.lt/images/files/motinovusawepojisim.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/776143707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=betta+stomach+bloatedPDF 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_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 18020 bytes
SHA-256: 69d4006902059fa2c75f0d519887db96cfeba88032682a822d2a0fd627372611
font_01_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E0 10532 bytes
SHA-256: e59985b73c06b7ac78437af502f86957f6bd0140537fa69b75e6d430af2c535e