Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66194ea8ad13a54…

MALICIOUS

PDF

94.5 KB Created: 2021-08-31 11:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 12764a7ea9e03d9d7fd57a50a43d49e0 SHA-1: 8f07286f1a49b5628407a49f0a322890515fd4ca SHA-256: e66194ea8ad13a549d170902b6fac2219510d4d5e99a9f968fcc2ea658564c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous unknown URLs associated with compromised WordPress sites reinforces the likelihood of this document being part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://honda-vo.com/upload/file/92132822045.pdf In PDF document text
    • https://sharenkon.com/files/nezanawebowutuwawilofaso.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/814efefb921241197dc6337a162e5f67/vajilinujenetaxiwadebuwo.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/sexavibejoxol.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fogaforilojulexuf.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/v6tt5kfq4oq1dui1l38fbth6ug/85258942876.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/44820942575.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/lajopumunegitodofirunen.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2e254d80---3608420657.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/027dde4b7ce31ee819b5db4009b811bc/pugewoxebovix.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gola2ieksijol543ljd50ke2ec/bisimav.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/damuzig.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/27157644596.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/25966359031.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/94057157420.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/72769500887.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610446a3c4674---99137875306.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/bewagivikenawusovexolenin.pdfIn PDF document text
    • http://esistore.be/userfiles/file/zepulugor.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/48150040195.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/t662b3okfk3dlhjp48lq5ft384/4102869504.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/74471689512.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960072bea3d---85317729477.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/kukajuzuxezawulata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=three+particles+that+make+up+an+atomPDF 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_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 10796 bytes
SHA-256: cc87f61bdd1f4855ae14051cc958d78b5009920af139030cea169f813656bc03
font_01_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 17976 bytes
SHA-256: 20406f83b00f80c6cbd35f3b74baa7b01694e83674eac4e260f631ef624e7301
font_02_sfnt_off000153b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1