Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c7afdcf0d4e950…

MALICIOUS

PDF

96.7 KB Created: 2021-06-12 23:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b86253b2cc3c0c6edbf5b50b429498f3 SHA-1: 55632dcb22d7b1e866a66ebbbe1a6352d9c503da SHA-256: d9c7afdcf0d4e95016c769bf2971d90604be9de07c91c969994a0ba5994843e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The document contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to distribute or host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=australian+shepherd+miniature+puppies PDF link annotation
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/54ffe717258ffd805bf51f4043dca826/dodiduposokonejele.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2b33ed1f---75575227004.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608a64f7b3b94---vewagexegivi.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/25350353030.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/90288640947.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f65a56eb0d6233be5fdcc7a151fe4c70/mokizowu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/59n8l6m9gae22c92u86k6l09u7/14665202058.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdc533068---75825407534.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076868cba4f5---vosimazovafewirewaketebes.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be5a817e46---tofirekonuxofugi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a146e1f3cbbeeed151dff34e73a406b3/17469488082.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/31623601690.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/28154529261.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44ae99f58c---pazididor.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a57c14c97d1---83681324023.pdfIn PDF document text
    • https://medtek.vn/storage/file/gazeduzagijokapagoj.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xagogigogazujedaxetix.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/680a6619d469ff7fd63208d7b0247bba/10788039693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB1 5188 bytes
SHA-256: ddee086dc63a22cf6a56acc05e7b0f7e13dbba30bf133d34c85745eb51aae904
font_01_sfnt_off00015029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15029 10668 bytes
SHA-256: 197c7ff79388ecee84f17ccc6de8c0142c7a6e0b0286d9ad18231340b5f69d86