Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1db960af3906ae…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 01:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e774b5e8a27f6056f5bde5805862fccc SHA-1: 3e846113c181ab446c6cfa74c47cfdcfc1fc300e SHA-256: 3e1db960af3906ae289b6f6e339817f8e3c28fa0ade6d523aa649aa0807b3a5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous external URIs. Heuristics indicate it functions as a link farm, with many links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

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.
  • 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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e2e55aea---nazakonofowobupokajeg.pdf In PDF document text
    • https://abe-rdc.com/userfiles/file/96563277264.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831ad6c059a---mikexiwisikitusiboxo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/6237209229.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/33473744440.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/nobufeziduwewis.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdd63d608b---mukevegal.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/36502200569.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bff5fd9e89e69ada7a060449a25c0bdd/duxodinil.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f13ba2510905bcdfe1e90feb2c7bf233/gipemurawesurenupesaj.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/jomitixujejonemewugimij.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/vuraje.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/10209270378.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/xukitezuvi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c625d3dcf53---nuvijunefefesuzow.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/31524846626.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/9214465615.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c7a7a6a1104fc9caf8ae6770855c4666/ronemalubulefokos.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/jazujavuviji.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8ffe80f0d28f7cc0a4dc063b1d2fdade/xebonifexukab.pdfIn PDF document text
    • https://binhvi.com/upload/files/vijefet.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/12821618001.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608669ce0af27---sawomejikupax.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0e6427d3cd5349b683c4aec3ecd68d3f/zamabenidetefizavalupaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+gifted+parents+guidePDF 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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 10676 bytes
SHA-256: f985ac125bee0a169200def5025637d4b99f16c233b3a9b046f6d286b908e061
font_01_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 17996 bytes
SHA-256: 786dde7af884ec02931ba83713e01c826a4c7517cdce858b7c805f79dbb35b0e
font_02_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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