Malicious PDF — malware analysis report

Static analysis result for SHA-256 923902400f470654…

MALICIOUS

PDF

93.4 KB Created: 2021-09-01 08:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 844c9237b59edfcacef9786a7ba94f46 SHA-1: be40bf5e54db7b724edf1717a47e6b8a8c4bb547 SHA-256: 923902400f470654e8f8655ac58de07e0350c5570bec0234d23550ad53606139
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting the document's primary purpose is to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nj4vppht71u4o2396vthrdq849/45960951387.pdf In PDF document text
    • http://alpha-th.com/userfiles/file/13099264183.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/rajokiwajevijino.pdfIn PDF document text
    • https://red-adlay.com/upload/files/93970036201.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081800735726---32326279742.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9a421585bea4d666486787720321372/67542671842.pdfIn PDF document text
    • https://actor-conseil.com/files/file/bukitug.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/52979640561.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e06c9qspu7qldqoild5fmhlfi0/xirobofosidajabotulugoj.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/zanali.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/daletuduxafazib.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/modigowapiwobapivisa.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510093328177207.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8f727608d0fa041e492805b95aa29835/4017883656.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ce70c70647f38d23e7fa583322198d5e/56224624317.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef900cb2df---37677962617.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd407c971a1---40819367373.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/sewajokif.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/dbg6ol4kcguf8c2ekcvg648933/rirefawewosipiz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f36391f3---tufuxejaguzer.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/basetovakikukev.pdfIn PDF document text
    • https://somogyplusz.hu/files/biboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=building+for+the+performing+arts+pdfPDF 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_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 18844 bytes
SHA-256: 417b142e8c29f4420bb226741d1873f0225f5959c1a8a0ca60891f1ab388a00f
font_01_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7E 11096 bytes
SHA-256: 3a3581963e1c804d0a6b97b322bc84d219dad5445e5307f40d5f957a88e1fb01

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