Malicious PDF — malware analysis report

Static analysis result for SHA-256 b089f27230f3387b…

MALICIOUS

PDF

89.2 KB Created: 2021-08-04 19:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffe9067157e5aff3929096763ea8f579 SHA-1: 00d9fe09337b9afa143985067f06d34e8a678971 SHA-256: b089f27230f3387b026f805f2f04441f17d866ec020e3cd6b8e31488f4ebb2af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it is a link farm pointing to compromised WordPress upload storage, with many distinct hosts. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b60b07b73---puzusurujigewixagedoruwi.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c5c0d4f3b38ed90e76bb36b3c494480c/66397166942.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/malifurimonode.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7bbd4bba39f97f26bca6fda36df17dd0/rikezazesodagat.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c4566f75---96424322641.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/cb3ef18615d3d3fcea84ba88b0896209/52587304032.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d6b706155---32319033405.pdfIn PDF document text
    • http://cycling-software.com/files/file/29382342532.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/retomabatexipimuxawixol.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/77118632647.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070461a11926---vavefo.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/99969273866.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f867b2b62e24be678a007b6528d3c0e/teretajuvudifine.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/272bfcbfdd960e91d97f57caf8ffe0bd/38478890660.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/mexekagikisum.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e7b15f71fef31cf9c41ddcc393d671d3/66907013508.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/86789088883.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/42298314025.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/37230724623.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/45221975772.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/87aac2cdf2e954a5b4a9abf8ffcf8c59/powoxekarivalogozepaxuj.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/witidazibazap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=affirmative+tu+command+form+of+serPDF 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_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 17912 bytes
SHA-256: e5f507e0b5b8aa9ce6110de6e7572fae0baba757496492896053488d23f408af
font_01_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 10736 bytes
SHA-256: 4082c4ea5a6fad21ac0e8401b81af8a2e4405469506c3e251e0923d119c8474c
font_02_sfnt_off00013dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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