Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf9d3345707139c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 15:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d767be12e1d98ccb580ef591b9d67b69 SHA-1: 5170471e16cac7e95de8f8e45122846eb0285bf8 SHA-256: acf9d3345707139c767d796c181e9fa81c1905206ccde6fd0250c43ef5972c06
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on potentially untrusted domains, suggesting an attempt to drive traffic or distribute further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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.
  • 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 http://officegate.biz/admin/fck_upload/file/54611739653.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d6d5b3027---dulojinipafasuxep.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/worutaxaguxotefusowosi.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/xumuwulozidafon.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/88457983665.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/74385000446.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/nusofejexukikuku.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/dakegerozukodob.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/fonatuxokobebavumit.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/depupan.pdfIn PDF document text
    • https://akemi.ro/hirek/file/latejidawezoxuxomiwed.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xikepibejaxeli.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148be3eb29e4---kevajuloluvewibimipami.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/53614723327.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/58439807500.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/nakex.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c78e2dab9---jedizutemi.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/7425436574.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/15700682887.pdfIn PDF document text
    • http://holzbau-napetschnig.at/31970677174.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7af14315---49730378001.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/72632389366.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/kuvir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=all+apps+installed+on+my+phonePDF link annotation
    • 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_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 17792 bytes
SHA-256: 57b37c15d7bfa5f757cced73cc5889a5aef0bb06b428f37f939e71a2cb780a31
font_02_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 10652 bytes
SHA-256: 0d6929b5b29c9062471f731d7c7d07168d0c5689acd45a06a07490ce3fabe20b

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