Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c313bf12fd14f5a…

MALICIOUS

PDF

85.9 KB Created: 2021-08-04 08:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2338d7874d4f0f4d7683e9c87b2cf39f SHA-1: 3712c31596cf94319f975d4b41411018fb1b2861 SHA-256: 7c313bf12fd14f5a0c1c2edf1af4a7bae9760e335427761c7640f540ea8bd79d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. This suggests the document is designed to act as a link farm, likely to redirect users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://chcial.ru/uplcv?utm_term=cours+allemand+b1+pdf PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6e1c2165---foxewalofugomuk.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/21223405618.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/liraz.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3gsh24ab5p8bmb3fqvjgl2vn3i/balif.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bb3a6nl9fbcqhjca856gif1kq6/83300455323.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/45468737862.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/kulenugozowipop.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/vefinenizadejudofakuj.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2fd19643---28003241237.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/16744910803.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48912e661---roxuwirebunimi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106701d192b0---45916770204.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/1380149740.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985fb723135---42159591330.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/398300787e4df9e0080f5acb1ca70fca/sanebipeg.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2de457ed9128771eb26285276ffb5632/93683652162.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/79645106461.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zurogedokemaxapex.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/ralobexabim.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d0195ed62607067868b12765add8a4ab/93868803063.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac689c3a213---65262879851.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/93997974670.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/3592995155.pdfIn 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://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_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 17960 bytes
SHA-256: be54f1d73f0aebf86626cad17f42c3cdf87288eedf6d91ccfe5791fc88bb9918
font_01_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 10792 bytes
SHA-256: 07b541cc5cf819dfafd74317271efbcb7927aceb4761e8d8fc0f52655045dc1e

Open this report in the interactive analyzer, or submit your own file for analysis.