Malicious PDF — malware analysis report

Static analysis result for SHA-256 487152d7c6ca8bee…

MALICIOUS

PDF

75.4 KB Created: 2021-06-14 13:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8583c36ee66b821caebe6d2013d15894 SHA-1: 8e73533eb42fdecc791b63bce8757df960e40749 SHA-256: 487152d7c6ca8beeb13eb98d326f2c9991b69961718c3636a9f3333e9cbf6ba0
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Android box remote air mouse apk' and 'wkhtmltopdf', hinting at a lure for potentially unwanted applications or malware.

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://krisoc.ru/uplcv?utm_term=android+box+remote+air+mouse+apk PDF link annotation
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/646f3245f69e4d086d23f06dd33849e4/56026513959.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/fakatipiwerifosalu.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/barowerosonubiwudonesokom.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/feduv.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609688a641d35---jezizasab.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/jufurosadike.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0521277c1a716be2a7dc554249f7b0a3/vavufudomoniwugavuni.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16070b792dc8cc---bikejakizelesavokode.pdfIn PDF document text
    • http://kham.vn/userfiles/file/29014649296.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/bbfb265e9b2cb55e8f3bba921dc9c3e9/47383283825.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/54a530872297da8e88a23d6c479f061b/telejodeli.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/degowo.pdfIn PDF document text
    • https://33mobility.net/uploads/files/18841022472.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/tawijinaxa.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/bolapabegogodawado.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_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 5332 bytes
SHA-256: 243bb8c1f1a078e2bc6c0ef0026d5f7bb14cca5a149a226d64ff370bcdf1e29b
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 11316 bytes
SHA-256: a4417f0f1060de74bd3609924aaf4ac47658e560ac927e5c2bc15e4e8195a959

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