Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bf6bd0316f218e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 07:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14685858c02ed073ea11f505e657191c SHA-1: 4e2e9f2aa8765db1d8e89a63ec7eccf18d4c176d SHA-256: 29bf6bd0316f218e19d0dc6f774e0abdb87fed645836d6900b71cec354a3b488
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, including links to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a visual download button further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=download+realmcraft+mod+apk PDF link annotation
    • http://stringladies.cz/userfiles/17254207601.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/73323092532.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/kamepu.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631089583.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/77532707592.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/60526273542.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/27211377421.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/97286937394.pdfIn PDF document text
    • http://izr.fr/files/81907996431.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/lizetipiseruvara.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/5vvbsaihecr27lajjert96ihnc/fexigorupuwotiv.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/modozezepupateminupi.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fozemitosozixawuwofikos.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3c0ec8c3---rifiritemoluwiwizozelejut.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a17e8f241---41118259226.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/66751295482.pdfIn PDF document text
    • http://licausi.it/userfiles/files/pogiluji.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/65394728087.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/tejegoxewadojejetupivub.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/392047287.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0935278f6cda34a43580d7b781f32247/46670630439.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/mudilapaj.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tinukagenisof.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/8363343369.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/bejodejatutex.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_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 19088 bytes
SHA-256: d12e99301097bd02c8cc2fc717eaa5f285014b7135ca771e779d783ddba5d567
font_02_sfnt_off00012eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EED 10700 bytes
SHA-256: d60b03f7581b8c3652d196e9ebd4972488610b92ce0fa877e273148ebbb9112e

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