Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb7f160a35e6162…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 08:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5771fd321f42b3d2ad05dbcadd1148c2 SHA-1: 5629ad573803e7c28da7e68fc461f2ceab3a5e6d SHA-256: 8eb7f160a35e61624c4053f9f16264d2880013f8fe03c2d8a986b06c71fd841e
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised CMS uploads or are part of a link farm. Heuristics indicate a lure for password-protected archives and a visual download button, suggesting a phishing or social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a malicious payload disguised as a password-protected file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=how+to+decrypt+password+protected+pdf PDF link annotation
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/87692246774.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/vewuvizunelaxetubibupup.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcea928b96---4788047394.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/36182302171.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/uacnc00hpagdv9p6cj4tb98pb4/54209122484.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9e9bc086d---bogafogaleburuvamutuj.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160984006dba94---dedenopanalogu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c256512240ba5e0a8bc2829a5a430b4f/wopibuwaguzov.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de20512757---nabegepuj.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30deed3fa---nanuzeleniposozunabi.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/wekibofaberonaset.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/pasupiretar.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/nasaki.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/denop.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/da76f32c093f82f6ac1979579a45c5b3/zokofobikeloxulukiku.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/23438377759.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/9439160306.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2728294c80ad210cc7fc9810f59748d7/95124374671.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//55204560789.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/wufedovexelevebi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bc5c61d9---garezebufozobuv.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0b42baab---xowojositubenanevajolite.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/55727881928.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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 10560 bytes
SHA-256: 313b333f2ae8538779e9b96c2c422556cdb2b64699f747a080ee93248c48e438
font_02_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 17864 bytes
SHA-256: 91f332c18b93139001e9a4f797737f08fff9838d6ea64998dda643bdb0fbf964

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