Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efd1ce766dcb736…

MALICIOUS

PDF

90.2 KB Created: 2021-08-14 10:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c34739213d88c4737a421fe5816f7941 SHA-1: fba728aac97ecf4b72e1b2df7e6670914406664c SHA-256: 0efd1ce766dcb736bbc259a1b89d5885f45b1d742681b073106a789fcea2afc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://iberia-ex.com/images/blog//file/43040690857.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/831d7a066f798e6a6ff7c010996997b9/vukewulimepabidev.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160815632a1e25---nopidulatuze.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/8352023292.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bea73b62dfb---vijeloxenuxefuxeku.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/jizoku.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/80852d2fa2429a6bdb2b816208cbc35f/16255484862.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/43540888576.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a4f74453---fetomuxugenadufizetali.pdfIn PDF document text
    • https://banghenails.com/upload/file/zijidefiwaruwimoteji.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/94598336702.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076936dd380f---toralezenije.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9a5c0fa0b4726b95c928766c28f5b1ff/35701240442.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/toruvizewi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/62826593668.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/rakirolotal.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da5f6509e---tonutasemibisidigu.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/6742072456.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/71b8b2148f8d9cbd389f7d518b632b99/vifiduk.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/fezuje.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a132f4d79eb---popepo.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210620163559_922874370.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/nudit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=marvel+super+heroes+vs+street+fighter+move+list+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 17064 bytes
SHA-256: ce87f3f3b0d2528088dbf9f33942cf70622cde4b442d6f98d1e15945be461b3b
font_02_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 4912 bytes
SHA-256: 6c1475211f47afc80de8573eeb8ff36a868c88c094d1527c828619e67a13adcd
font_03_sfnt_off00013eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 10980 bytes
SHA-256: 2f195949a4b2190238da91625e28672bb2a0ba75675f5748840d50848fedff38

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