Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4d84b84aebc5b7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 16:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7fad93956202d6faf3382ea95d0597a SHA-1: 5a2c53ca55929a13b974c54d207a0d68f0f52a5a SHA-256: 8f4d84b84aebc5b7af2179fa14d96b2e9a3810904a1a1027473d16d8fef07b78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the link farm structure are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084220ed08fe---vififenazedipitu.pdf In PDF document text
    • http://www.cbs-emballages.com/upload/file/32282924086.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/26125957270.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/dabemaz.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/gifox.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/gokunamemobavaxonugigoxo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac075088248---vavorufanirejoben.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a737a960e04c52e713b4f95f9270354a/2181330578.pdfIn PDF document text
    • https://socardan.com/userfiles/files/nifurugefezusezuz.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/4172641763.pdfIn PDF document text
    • http://minhanh.com/files/zokipubabaworojudax.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4e4e78ef0---nojukawizerebubipinid.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608686d542262---juninokoluzukasivedesuxuw.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609133de5d30d---kojimokegafeme.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/53900673927.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/49440693612.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/25757530658.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/50764286424.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/43498855239.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b586be3f0---86737503632.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/maxakaxeditetorolotosebox.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba110bb01f---wufovabizitulekatetan.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076253c4c388---82544782575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=periodic+table+elements+details+pdfPDF 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_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 10924 bytes
SHA-256: fcb2c4965b2dbc7ec3588a1e35d2681c63ae9e86e7fb95fc5df3e529b1d8336d
font_02_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 18460 bytes
SHA-256: 7b15dbf5ff8f0b98a309457de18010a042203e4b6ac2cfc18d824c0d9d525f54

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