Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5484e98d0124a38…

MALICIOUS

PDF

86.1 KB Created: 2021-09-08 20:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 75efc23c77e5651f819ce010890db938 SHA-1: fd48e0777a4cd55483c2f4c51f4091903914da3b SHA-256: d5484e98d0124a386d64a3c79c901e2e8d83fe9f92bd87c5db09046d4ae7de4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple external URIs, including links to compromised WordPress uploads and a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The primary attack vector is likely spearphishing attachment, with the PDF acting as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coachhouse.info/assets/file/78028055496.pdf In PDF document text
    • https://panificioilcavaliere.it/userfiles/files/59639026683.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/valudotuxi.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4692937611daa7939bfde36ca24c6323/wakupomepipatomok.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/1395675872.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/zadejog.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/36395591714.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/62a1ee568452427f6107fc3f13e6dd24/japunu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/pagowov.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/lemamusuxezimuzu.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/84603099850.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/53387644543.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/nifujir.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fc5290bf29ea7ff3567b488ffe4e0e2f/78567833158.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/71633931898.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613121d0d671a---jejewolunonetodudada.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/51209026269.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/gaxekojanituruvexez.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/janoliwo.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/87401582592.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/modumirifadebi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2c6de9dfe5f967b8589bcea5d5b72e53/texowetewut.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136a1cf688db---vikixibedap.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/18265739048.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/70830415300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=arquitectura+de+computadoras+pdfPDF 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_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 19796 bytes
SHA-256: 6885c5499b438333eaf1ce3d750397132d3c2c94a2d2260994ddf5575981ab45
font_01_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13183 10856 bytes
SHA-256: 3cc24a9aa4b5e9fa5dd099af9986e8949692ae76c24390146acaf83765d80116

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