Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ef0ef45abedf88…

MALICIOUS

PDF

227.9 KB Created: 2021-06-08 16:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d4ec7eddc276b1119b1e2f0f3b8c29f7 SHA-1: b4176a41f888cfb13aacbc6a4bc680812abe8569 SHA-256: b9ef0ef45abedf88b43dc9b3c08a2106c0d32d69659071102482e969f48c1fa5
166 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a strong likelihood of malicious intent, likely to distribute further malware or conduct phishing. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://catamma.ru/uplcv?utm_term=inuyasha+full+episodes+english+dubbed PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078615728721---15064024822.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940fba7e3ea---webikuzadaluvowazigiru.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/muvuxekinomawanana.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/vezirevak.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/donexatutasunidibarus.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c353db4fcd---vupewomo.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0d687256b---fobupinesebomenogupames.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/6s8pd2n8jhomieoh18d1sfokcf/fexevex.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/98a177f1c151811dc8405d3f122e8dac/vuwobixo.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kabapinaw.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bf49be3bd8c---kamozepuriguw.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/80c69ce5e4de625b743637b3000b8f47/gisop.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48f89c40f---53788482024.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qv7d8pj12i7nr3epnhne06ggsm/42238932859.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7f6c5b27---katorifutenupo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c43370ab---53781727287.pdfIn PDF document text
    • http://www.mangareader.net/226/inuyasha.htmlWatchIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016af5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16AF5 162852 bytes
SHA-256: 0a982b4c272b6f4426cc0600c956cfe239b4dcfd004536e08456de5be82f34f7
font_01_sfnt_off000348f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x348F0 5388 bytes
SHA-256: 28bb7ab6a37a7242ac0b66b675acba2e3b967a2e6ca510d98217f135eb441547
font_02_sfnt_off00035b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35B4C 11456 bytes
SHA-256: c5a733ec360b2357a74fe0b1893a7efe42c7bf364abe4e964bbd0c7eef6c2c31