Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67c5126c190fad6…

MALICIOUS

PDF

85.7 KB Created: 2021-07-14 02:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 390e375f71300174a0f85d3c97c8a32a SHA-1: 945b6a10619fad0c290f7c7e527931eb7d947817 SHA-256: e67c5126c190fad6938a102e396ea19746794867cc27811a3544188d31eb5e06
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external URIs and link farms hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous links suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=country+lodge+in+thabazimbi PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d0c7a5d---vuxibux.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/pigon.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/gubagubupawurivojiwibik.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/57639140945.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/zivujokafodaboguxadis.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qki9lelfa8n7e7gl7hk2ieht3d/70074470253.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/zojavatotixarib.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff3a0903d---33541283482.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160959c9ee35a3---gunojixupomekarorogef.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qp8h94bpjtlc9j5171viej13u5/24522710761.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/kinakazunak.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/46173ae5bd4e7238effd3c3e60684184/52351711317.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/ad04cc0fe89f4a06b5382df2850f5032/48942088417.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a482763f0---2332348744.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/155388751060a65ba1b0c0a.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608581be0ba83---49409657389.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/38296837352.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/nikuzogolimusare.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/texafiramaridotik.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/tonixezefiwaju.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7rai17uom2go4p85l71trg6br5/barefilofuzijemafomoj.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/74388068842.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_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 10972 bytes
SHA-256: 23df70368f3dc9b7cdec383ebf2fdc28cf9d84aab913d593c60c8f513610c561
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 17560 bytes
SHA-256: 3c92338ed08c70a09ce7d51f0fbc13165e24ea96a0435725e9f2ebad77c82e75
font_02_sfnt_off000131a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1