Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55c62121eaaf010…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 12:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f92d56c963edd3bd164fd2cf3adb5383 SHA-1: 8206e79427f993413f65e554ec3b267ca7e9fe9f SHA-256: a55c62121eaaf0100bede55558a13a52a8648bd3622e62028778d8ced97a6c66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to disposable or compromised domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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 http://toyteepee.com/uploadfiles/file/210916233447529311w3ibkn.pdf In PDF document text
    • http://paneldeconsos.com/userfiles/file/78609217114.pdfIn PDF document text
    • https://wineart.online/userfiles/file/kodesidewu.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/wizizevexigazowo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/09j87pk6gddkruo6il6cio3ca0/10097601274.pdfIn PDF document text
    • http://gibisch.org/files/files/63922571744.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/52900001025.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/pawefusasaguvuvudumufajet.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9ba446413---wujad.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/35739463423.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d25c8b43b8dbafd5779415811f3e911f/8134260428.pdfIn PDF document text
    • https://weingut-suppan.at/files/59428616228.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/85343155646.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/runez.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/tebixolakupa.pdfIn PDF document text
    • http://teakdeck.pl/files/file/rusijasojaferevajog.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/lopotujekajokuposarewubir.pdfIn PDF document text
    • https://ptogel1.com/contents/files/muwinorafinisu.pdfIn PDF document text
    • https://invision.buzyhub.com/files/vizikaxebema.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/dekesabirikatotamipukago.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/tinenorimedefamisavo.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/38302976395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ruin+and+rising+ebook+freePDF 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_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 10764 bytes
SHA-256: 10893085073a3896ea1c3ff824a5549116349e17d59eb355f4ff6cd9f09320de
font_02_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 15528 bytes
SHA-256: c79bd918c56218febc98ac72771bcbecba22395b24977e9998943be943041999