Malicious PDF — malware analysis report

Static analysis result for SHA-256 a353a59ca47e4381…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 07:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf7d0a905a1c41d699fc090748978f2c SHA-1: a55a377533bcf6032b94f775a90490b5c06b9d42 SHA-256: a353a59ca47e438111407dbe2a58b48c9e4a0a07eb0a27bb2bd48df4d12c0329
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure, with minimal text and an image lure, is typical for phishing campaigns aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • 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 68 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.
  • 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://webshopplus.nl/app/webroot/files/userfiles/files/51675931488.pdf In PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/97331201593.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/93536929563.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/74079207401.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/xipovebawakekazime.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/48458976957.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3b58d09abef3229d176bb55b9b292eb4/fiwurevanobimaburu.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/3629983934.pdfIn PDF document text
    • https://ysh.my/userfiles/file/71571968103.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16149cfbbedc7c---51403674401.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/sipupejatuvororidom.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091103503054.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/78981792565.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382909082c1---28867815210.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/karapojisugokulebodemoza.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/25233828219.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/jovuzuvesejofegegokopene.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/fabiga.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a347b3f52---31292720742.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aee046c19---kokij.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec0027a5e---kixexeb.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/4169294755.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/edbccbcfea1d2034476ec80a0d957365/bupabujarewile.pdfIn PDF document text
    • https://phm.vn/upload/files/39381353765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=movie+hd+apk+old+versionPDF 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_off0000af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 14600 bytes
SHA-256: 531df9b2b687e1d117e612f33a69a33522b8fa2a12079bcf2ede005519e752f8
font_02_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 10544 bytes
SHA-256: d59a09701dc1737343c40d59f1f06d059581e9dad4d20a3b2a96396bd30c1595