Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aef88168f09d04f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 06:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd57fef535ccf7a0c23889635b5680bf SHA-1: 1d512448d755d1131e116ae35a0371f141fa4a57 SHA-256: 9aef88168f09d04f387517ff4f55465cad22c091f754414abdb57395e8a2b67f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm and a lure for invoices or payments. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the phishing and potential malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://studiocastigli.eu/userfiles/files/wurilejoweso.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/2117166985.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131a273d5f3d---53050932155.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/pomukapaj.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/molud.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/lolisofatarakel.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/15849138557.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d5cb8a7d5a71c07dc3ac2f83d8048d82/vexifawajaben.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/pavigogodanagepemi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131651a1010e---2862666921.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/jorogufifedorafaluba.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864b7d2ca6---50428466151.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/54236655619.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409827a7d0b---teguzibipevuzunazof.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109092247359926.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/32250795521.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/xaboputerumuj.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/bazemazekuwiwe.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/42644263520.pdfIn PDF document text
    • http://egitara.com/upfiles/files/vinanez.pdfIn PDF document text
    • https://media-get.com/userfiles/files/32164559015.pdfIn PDF document text
    • http://neuroxl.com/images/file/moroxar.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/82444279721.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/94255731963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=modern+compressible+flow+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_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 17628 bytes
SHA-256: 8cdb44f649867b9fc22400551cb31451540166eda4cafa74952fe73554fb35d5
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 10740 bytes
SHA-256: 8dc64365dfd699b04c024128194e86be72412c4f15c60b9888fd626d63bcac2f
font_02_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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