Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab24fca45a95aab9…

MALICIOUS

PDF

112.0 KB Created: 2021-06-21 15:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0bc9fbc7cf0d0a845f8f34a37bb75a59 SHA-1: 4e7b9d62b864fe23df277b0db1c1568a6e924e02 SHA-256: ab24fca45a95aab92a3b2d1cf027b9dd66a3abe8a2c0c48b78a7d220cdb8270c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b86388f09---vemizeditizunamed.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781890fb72---73748290087.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab6702347---67269867360.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/10778595377.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac753a2c3f0---pogerivevekubaledozizel.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/0ou5jb3cdvp9dd2rqghr3tr1u6/reninoxudexusoteridakij.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/87354391081.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/827cc7ab0cdf7e77804ba11ea6ea671b/tifipudijolez.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0addd314b5232a8a3f3ab49dac0dcc96/89548506787.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/72403367639.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b59534edc0d6b1ba56c6cba2d3f16176/79638379998.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586748aad3---fufajizirakadafobu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f1555c46503f8de75d2d47b0a2b9aee6/80464835466.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=animeindo+naruto+shippuden+full+episodePDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001964e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1964E 18244 bytes
SHA-256: a14e6b0c54d2513483fa2badb04052390d9d2ef1b49e30aa32f82528d2cd147e
font_00_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 36204 bytes
SHA-256: 2a6493aab1d4e19b0aba8ed4107f76489a57f8aeb1538871b2df62e99d60d3cc
font_01_sfnt_off00016049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16049 5268 bytes
SHA-256: 24afa397356f9874725df03128d06ce965af121dfb1fbef1645ae5a2ddde6824
font_02_sfnt_off00017205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17205 10632 bytes
SHA-256: cb3ac3ec855abd833ad2be4c9f090af777cc253b5836ac517865ce80d354bba0