Malicious PDF — malware analysis report

Static analysis result for SHA-256 91101688a4e95bea…

MALICIOUS

PDF

85.9 KB Created: 2021-06-22 14:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e97d05fc41c29360bbd3f34f2d7abb47 SHA-1: b43c69fbb7e3ad228842b9030fb668f9a368a9db SHA-256: 91101688a4e95bea36b9f985ab9ebfab4df7befd750a14256b9e4f94a0d8dbe1
154 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised WordPress sites, likely intended to host and distribute a secondary payload. The document body, though heavily obfuscated, suggests a lure related to movie downloads, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

Heuristics 5

  • 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
  • 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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9f875c6db---53737698811.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pmn8pq2liijmtdkops1koh07e1/54010099621.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/8692051434.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/d8l9q6dv0kr7b43mov1ki9k3k7/gutapova.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c268cb46f75---fufesokobelakazuzo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160749700735cc---jaxudabikaxuwamun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cff69b224---58735737955.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vuzupumarotifuses.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7c941d68dade9a9787f43316ab521f85/89980463394.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc482579774---puxemulifeguva.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210523204554_pi4e5u.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/rudagiritejow.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b287d365a1---nedenapigifozowe.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/bemuzovukifalorofufi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c9ff177a---gekixebe.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gixaxarewavevel.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826b19b997a---29658838938.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/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lipstick+under+my+burkha+hd+movie+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 5712 bytes
SHA-256: 4df09ae14ef377508e469281bbb05da8e9c4f48b512c5c36ded32fb7d7643859
font_01_sfnt_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 12004 bytes
SHA-256: be0c05025af1a4e85e6fb5416134fba636fffbbc06da95aac30d650153c01b76

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