Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27e7810d06c7ea5…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 03:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a0c33c378169d1adf9611f4a741cbe79 SHA-1: c778e15edee2723c06aa11e6f220737fc1f6eaef SHA-256: c27e7810d06c7ea58fb573ccb15557f55c4ceea212d2a074b7ea16f8bc200e88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/aipgsc30vphssdcm8dpflfc75i/15271261081.pdf In PDF document text
    • http://www.lnk-creation.fr/upload/file/46317618530.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/wafezekipalotaxo.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/punemunidadis.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/solalijule.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/24266339429.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b1135565---85217670770.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/xorupaporarokubixuzi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f9148e79cfde649ea72abf0ea13549e1/raxaji.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ab70aace---32086968265.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/ec6cc67b53c2e24a0e1e9e48b125588f/jiziwevalufujix.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/nulewubite.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/56999343186.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9pq5gi9qad3vvf4qdmrsb0jqk1/38084303103.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d99c688658269dbacc0d86cf1fb1795c/10079888770.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/jumetumaf.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fa7c7c8ee007452568a4993568246208/99097239129.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i78jdmoe447oldk1357h1opbht/xobizinoma.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/12086213180.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7495229b429cab26d4c7741a93201d45/waruxotizafetowo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/67843917274.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/boligibiwagimujifa.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0dd90f12973b2d273510dfeec0340bdb/3531942821.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0256d4d1ca---tonigel.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/36160384259.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8e43e21df72c3b298d525ec16881b2df/tiwinobodimodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=emergency+ordinance+meaningPDF 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_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 16080 bytes
SHA-256: 90fee31f739ca2f5dc3d8cdb2b9c8d697e5d57a8c78355078038b5a34b4d4346
font_02_sfnt_off00013d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 10500 bytes
SHA-256: af21a841cce8d6702d2e1ef0129206be26c9e913259540b9fc8e29e7313e03a9