Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3efc2be28093d8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 05:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1b5c7756bff01031b19f14d8409c91d SHA-1: ab7786fd297dd10831119460bbcd79b82876a7d5 SHA-256: 5f3efc2be28093d8e12fbf8d38152df9d6acb01d91712ee03c3ba21ac5bc3694
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully analyzed, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://benthanhsgfarm.net/images/uploads/files/59295858689.pdf In PDF document text
    • https://e-casainteligenta.ro/userfiles/file/wulabegije.pdfIn PDF document text
    • http://ahknchem.com/upload/files/40356622406.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/42014448871.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/32546199204.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/11258310062.pdfIn PDF document text
    • https://venus-forever.com/image/files/kenolapor.pdfIn PDF document text
    • http://sungder.com/upload/boxokoxojavofenozoda.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903130707.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/zakirexezenagali.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/foxazerojixasad.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/854816cd9d314466df958c276aa27c5b/wugozozilalidag.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/pipepe.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfbe7ba05---20892953322.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/veximozi.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/dugimagubazaxijari.pdfIn PDF document text
    • http://4bx.pl/public/file/nopani.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/84025581455.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/18884030525.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367764c6b02---niworumoburuvinataxob.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/dabiwokapekaxamapu.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/98620827457.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/fenel.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/27952850799.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/20827032630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=discord+apk+para+pcPDF 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 17596 bytes
SHA-256: 76441ebc72889ca58a081514b609605d99a0568e11671e7602071e20cc609f87
font_02_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 10220 bytes
SHA-256: fadc45abf18714652f8105df65875f590ce0696d3a428648806f17dec6138033

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