Malicious PDF — malware analysis report

Static analysis result for SHA-256 1038406ccda3c95a…

MALICIOUS

PDF

113.8 KB Created: 2021-07-31 07:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d538f9aa72b48a1378a1e226e4311f8d SHA-1: 6e6ddd291fd4b9317fd88b0564eb7bed135fb03b SHA-256: 1038406ccda3c95a5f7b2578b030d7219da2611c055d8532b51e2b3324af91ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document hosts a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://personnelcle.com/userfiles/file/vusunab.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d58c392cf---20459566327.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700d50bf042---jepapaludevisoseve.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/13ec46f7021a98576f209af61ee887b6/nunojedutameweduzin.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160908c5607836---53574153139.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/xuxelenotusow.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6acaf089---18346065074.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/wapazexabaluxakade.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/17626046175.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a851d9ee3d---wagow.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/xufuvova.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/90094459711.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1f89c1645312da55da4b291a45ed77e5/turaxewexomi.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ee34b40db29eafca0339e9ec9993b1f1/nodariwojime.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c2e63e43---8961241839.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/pogupanizijebevuj.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa99228dcf---rabowunolubu.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210504193830083109wg36l9.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/85527751972.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/24401275926.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e45fcab994---68807765846.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/suxejusevigeme.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8a36e7604edbd7feba32f63a37e25bc9/lufaguresavususiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fisica+para+cientistas+e+engenheiros+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14966 10960 bytes
SHA-256: 2f593785b083fd4d7df5461edecf5add2386748cd2d43f8b8bc7e276ec4885cd
font_02_sfnt_off000162a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A1 23748 bytes
SHA-256: a1c334009dde16f54f4a24efcf9533eaeaa58ef656238ad78fd58dc99136cd74
font_03_sfnt_off00019e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E69 16792 bytes
SHA-256: 6de3bf52d22c3d291ee897ece8215e588aa6a159337a3bae6f22deaba10cc4e5

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