Malicious PDF — malware analysis report

Static analysis result for SHA-256 7443ce1ac673f931…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 18:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f45e51ddc97c7b98cc91bea1e1b3fe47 SHA-1: 6042cfb7321483e3990963a05f4138f804501018 SHA-256: 7443ce1ac673f93173270a99a4e4daebb22e4ab0703bb77d2a2ecddfbe12ac10
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+fire+virtual+space+apk+download PDF link annotation
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/jegamiwiwel.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f9a6026393b59d31feae8ea1094a57c0/20226721247.pdfIn PDF document text
    • http://93564497.com/userfiles/nelekezolubas.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/difesujolegovexopafi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136d75e0eb95---fomonopukigarokazemejur.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109090601075165.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/38036233860.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/20873560889.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/tipata.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/49066249779.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/14635673265.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/rizumedewonugesaboweki.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210909_0D190F21826686BE.pdfIn PDF document text
    • http://metall-press.ru/files/xaximijif.pdfIn PDF document text
    • http://asja.ua/userfiles/file/metinidusubavabegemawupe.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/wafiwiwomoregomot.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210905095743.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/lolegasovuporuto.pdfIn PDF document text
    • https://cet.sk/res/file/pinivipo.pdfIn PDF document text
    • https://webaprint.be/img/file/gubilavoranepel.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/gatusulukarol.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/61702057019.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1a49d274dbd91f30d8eba2de7b11daf6/97691099057.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_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 10936 bytes
SHA-256: ed33f8d01d7f8d3fb9ce5892b5be2db42e42d5d107e09a3459a1bbaa2207d684
font_02_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 17840 bytes
SHA-256: b74b06232420fbddbc2e63638975368e85c95852de333bd27d5776b475a47e10

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