Malicious PDF — malware analysis report

Static analysis result for SHA-256 9134d93dc34b1c1a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 09:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7676728ef559f3a49f36c2a503c405c2 SHA-1: 5d8ee6c0d10a924e6ca4f8980a346e91d4abdd0e SHA-256: 9134d93dc34b1c1a9460cffe3880bea25ce2a3cb46eaaa44b101675f79117843
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=kodi+17.6+android PDF link annotation
    • http://ativn.com/upload/file/94541312983.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6a3c3cb7---kuxovak.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161359581c78cb---21456125602.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613690b925daa---xidujeminadepoletamav.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/38738500049.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/pinesonulajom.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/39194431793.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/rizufafofolalowafe.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/lawadodegudolojus.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/devomuxuluwoxo.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/92287476574.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210915232954.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139537765374---xetigega.pdfIn PDF document text
    • https://umartravel.com/files/sexuwarezogi.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/putes.pdfIn PDF document text
    • http://falerisztika.hu/tmp/89062847255.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/xewitekizufedup.pdfIn PDF document text
    • http://lj-group.cn/upload/files/26041165826.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/tonepenapigubisisotek.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/wevijudumixud.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/99648565206.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/ravene.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/jumij.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/20864431385.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_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 18256 bytes
SHA-256: c7c90539047954fe59a07c1e125136e5e12f724e3d113d7bc3c0b58d82537bd6
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 10124 bytes
SHA-256: 0dcfe68c465d4368eeb9aa015fd24f5b9f0c1f1cfd2c77c985e48166942d7711

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