Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dfaaaa1acc5b17…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46c5e07273c29b0906e73e4074a161e2 SHA-1: 71e522528b3b90ea89486aa9c6dd1e0df1a92355 SHA-256: 45dfaaaa1acc5b1716a0fd73ef27a329671447eeddf162e982dc7d5626bf9487
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rydelko.pl/userfiles/file/larifozeburupabofobo.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/file/mekuxokitediziri.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/nefaxilimoxetom.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd908bacf---luxegezilebenopika.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/8068212838.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163135336849.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/sisavesegufobunoji.pdfIn PDF document text
    • https://majubesar.org/contents/files/19765697623.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef1272005---85392967964.pdfIn PDF document text
    • https://fishboat.hr/files/sanixedaja.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88138669308.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/pufinenofulajij.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/kudegasoxugesokuniz.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/21184617480.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/625836cad34bcdff3d637a3bdda63e56/85067620621.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/wibebuzasarokifu.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/zuzinutulepovemuxe.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/14811274057.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/zipanozev.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/14807514416.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/65302270389.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/19443126322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+shadow+of+the+wind+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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 17840 bytes
SHA-256: a0be7f80cc5baf0502d75c79d485e66be5d3ed90817a844f4085cb730933b0e1
font_01_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 10496 bytes
SHA-256: 761c6934d70d3bb79667607e4bedaf5b1f60b35a7148d5cbac0c99cfdb54985f
font_02_sfnt_off00012327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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