Malicious PDF — malware analysis report

Static analysis result for SHA-256 b161a8e3c2aaf8f5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-10 01:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e864102b36954f252cff27770410493b SHA-1: 3bf4e9495d39ff6c0d51c002b51b50b6113b721f SHA-256: b161a8e3c2aaf8f5d4354ee78f5f07853f857956c121c7280339b6e3c77baf18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The primary attack pattern appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=cookie+io+game PDF link annotation
    • http://kezmosas.hu/files/file/kigazodisapobulimu.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/xesoperepixukorixene.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/dovifufasev.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/dorinojevulunaberelupoz.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/58064268185.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161369745b9910---vaputosutuzewu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7b3d67df---mituxeduxakomifegipuxiwi.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/82079595728.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/tojuz.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/90118583564.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/povinogugubusolixi.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/11116558735.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/tijisenufaxabaw.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/79051805997.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/17607208532.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/94026433498.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/dovanunitum.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///85546760941.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/38920114842.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/rufadegikij.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e9db1f31b9bf47cbbea0db11da9eeb90/92515632095.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334a30aabe---47720550411.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/rerukekexeturekexuw.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/rebonogigadamam.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/19284837736.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/lagudedovetiweja.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_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 10060 bytes
SHA-256: 0d5cfc5843f2dd80d80217a8b80db2171309efbe5637191fbf5f2f5ea3e1ff3b
font_01_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 17532 bytes
SHA-256: 4f7377dc8decaf5e5d033be82a18f19162e6a6f2c90facf92c5a130843e6c009
font_02_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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