Malicious PDF — malware analysis report

Static analysis result for SHA-256 c215323a7b7aed4d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 20:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e06990e7b67f1c8bc31d7973aecf23fc SHA-1: 12468a8f9ca8fbb0f1b59fbdccfe9ef42d8f9893 SHA-256: c215323a7b7aed4d2540c55602c05509ab9d89c53e887ee98ddb68dc4da90ae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the PDF is used to distribute links to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://angelofthewinds.net/ckfinder/userfiles/files/47707646874.pdf In PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/sopilupupogudulabuxan.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/3755032357.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614015a155d45---35597876824.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa8c56d843f71b4700b833fb95dc273f/xaleraruwofadexiravup.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/68223359741.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/30039515421.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/godawaxawufupefasu.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109070857469518.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/mugoxo.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/12845699590.pdfIn PDF document text
    • http://domosplast.hu/files/file/28654485831.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/14207029196.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/gupavowakosemusakab.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/3402947025.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/38c094ff93a6f4b9defef67d5f0d60b5/14135616892.pdfIn PDF document text
    • http://altus.pl/userfiles/file/worera.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/kepejonumigogepopexufad.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/kuweturirokesafamu.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/90761674258.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/98454766840.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/43142888895.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210901071044.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c43c583801---21680723981.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/dobedutuzuzejuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+phone+battery+not+chargingPDF 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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 10812 bytes
SHA-256: 8d4d3731b48afd1a8e383e71266a40dea2b1a1bdab57ff99901ecd38bd6a1125
font_02_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 17804 bytes
SHA-256: 055932837321761dd4e9f48e52fccd7afd963a73be88e3314ca2277d863e05ae

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