Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9401cca05b0e3c4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 20:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 676cfc803f95ad3311456a67142e4a23 SHA-1: c52a06a231c2712fc6fe8604d44536f360ab73a8 SHA-256: e9401cca05b0e3c4f49e1fa937a7f4eb3d52f65be35b931da15ea84d077b3a48
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm with numerous external URLs, many hosted on compromised or disposable domains, suggesting a redirection or download mechanism. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://inwebjor.ru/uplcv?utm_term=unsend+message+android PDF link annotation
    • https://thucphamtruongxanh.com/Upload/files/94167682908.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/naforawu.pdfIn PDF document text
    • https://avenue102.com/uploads/file/jimeda.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/68434327990.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/57591039478.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/livedejirawujopori.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/45563359561.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/wupaw.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/21514495441.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/kafojubigawizemavi.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/datepudepema.pdfIn PDF document text
    • http://safarang.com/basefile/files/61874808535.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145925668dc2---josilikega.pdfIn PDF document text
    • http://domario.ru/userfiles/file/najutezelokujek.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/96678184554.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/9810518106.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/58651894105.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/takuligibojokitenib.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/nekozujofaximoxero.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/denubevun.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614395839c83c---xejitopariguluruwoto.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366808d2b22---romudipevijigakuzisazat.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/40354437820.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/baten.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_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 17880 bytes
SHA-256: ee6de8e701e7a44c60f3e21ed36a69f55bf09971160ccf4549932fcaa89fa28f
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10452 bytes
SHA-256: 081a3683cfb40ff2e8321b988c4c72798f1631f5c8a9955ee0dbefa8a6f10406

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