Malicious PDF — malware analysis report

Static analysis result for SHA-256 5407191204da92a1…

MALICIOUS

PDF

67.4 KB Created: 2021-09-05 23:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f99d50935682ddf6078a5d30feddca2 SHA-1: 56fa2f7ffdb89056ba20de6ca7fc335405835c4d SHA-256: 5407191204da92a1778ead8c0c4cce2a7f0c5e47321afbbfeb4d3f27b9ff6380
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure, being image-heavy with minimal text, further supports the 'screenshot lure' attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://drafthe.ru/uplcv?utm_term=the+dukan+diet+book+pdf PDF link annotation
    • https://hotnews.md/upload/userfiles/files/35398870696.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/1sik7gvbououv1eh7vvbmcepkl/39133200440.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210604155917021.pdfIn PDF document text
    • https://zhansq.cn/upload/file/58245790194.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0042c7b8ba3d8124021faae10f73a010/remesomegenolab.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161063b22cf2dc---tukojolizotilukeg.pdfIn PDF document text
    • https://x-software.cz/data/file/tifiwusodomobitijererobig.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3a8497f7---17779058162.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd970adedd7---96638613646.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/74689242206.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/mimifowipib.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16106b4b3727be---54677338687.pdfIn PDF document text
    • https://tckontrola.hr/files/silofewiko.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/64517461652.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/53847735119.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/welavubonufadatemep.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/30420758392.pdfIn PDF document text
    • https://digireg.org/upload/34723569138.pdfIn PDF document text
    • http://amandamaitland.com/images/file/33549319998.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/waner.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/6828948928.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/82191401287.pdfIn PDF document text
    • 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_off0000adb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB6 10576 bytes
SHA-256: 8081d61b983ac153d3dd8598b0c5cc0a529daa75d10772ed90c549d8cd94af18
font_01_sfnt_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 14148 bytes
SHA-256: 49cd1d0ec528ad58ca7bb46128790238f1c9a1cc0dd75403ad49d772513a62e9

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