Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f4da8757c355e5…

MALICIOUS

PDF

81.8 KB Created: 2021-08-18 09:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 154f076d55fd9907458124eb14988876 SHA-1: 409af72b55c475f6c5597a6fb416ac878c026a16 SHA-256: 87f4da8757c355e5539746ca8f75e0839b2ed09423a3c709172a2cd4c3c4452e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The presence of a link farm on compromised CMS uploads and disposable hosting, along with a high ML classifier score and ClamAV detection, strongly suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=kingdoms+of+amalur+reckoning+cheats+pc+console+commands PDF link annotation
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/57427013670.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/12207682362.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/kavevuzaxetuzemij.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nolademovoliwipesitenur.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/71370637150.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wadilewomavobu.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/50149260112.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/temixozazevalejazowimujis.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16077dec804a93---fasifin.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/42819662830.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb00d4c58---42100757058.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/luneponede.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608778d852e3c---43867561903.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/60345974259.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3134b8cf2c993c102a4f9e51c708551a/limakisogazu.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/ditisuwafebukix.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d801fb74fca---26852769844.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/88319833736.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/542ee70c1bbfe81dff11b31ce5ab2e79/bowinebelaxu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee813b6e0e---xukodefatezunejudivox.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/239a447474c569c133f69c7fb7ea49e1/61558609912.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/nowoponogezupid.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160774feb63882---pebumevobibotutila.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/kugowonedudejigo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/336fe27e9c0a289bf11252d3f2fc09fb/bopajefix.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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 11248 bytes
SHA-256: 3dd764645f80c20fe1b16e07cd08f73aa4225867d21bf3dac42b2e67c7024575
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 17512 bytes
SHA-256: b1dee74de9e2417a8369e4e3fca1976654216e776f6793fa21059e5c8759f145