Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08bee256ddfa007…

MALICIOUS

PDF

80.9 KB Created: 2021-06-18 14:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d5c7d32da9905a2e9e7e6e013d7d43aa SHA-1: 7618c46512a440806ec7f5a91c7aa3314f1cf28d SHA-256: f08bee256ddfa007b61a4fb0df5deaf0636cd6754e586bbbee7a908ffd7f19c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a heuristic firing for a download button lure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to compromised WordPress sites, likely used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990828e20f8---14288647147.pdf In PDF document text
    • http://cuacuontoanthang.com/media/file/36568774459.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/039bbe0d0aa7e6e1dc41bef376a8e895/wazazezula.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/98303770498.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/disomibopakozigede.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ghi180f12i4gofqmpntegn5rbe/68515778529.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429074928409520.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7fd08599f3841a71336aae45b0f3330d/vulozimidefugoxofi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160811e5b138b8---8460625964.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a68a9b42d04a02af9d8fc27f5d575487/lusitofuzigaforexadosi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e6d0b5b8---40328078672.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/dekovovudijopojibawe.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/57904164706.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/futevijima.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/irgv76f5tcu9vc4u9oanpjj7rn/jilurajarivugibojifu.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/318bdb7e8910fd2c267ecfd2b0751f3c/77369574749.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/fikojadimidusesofajela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+r6+keysPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 6568 bytes
SHA-256: 18f4960a52d64bc83d6c304eee4b25c9ca37eec54c0f4efd5701b5568bea1fd1
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 3188 bytes
SHA-256: f6acfabf108fe60970eb6fe0895518fef38b88a01a5834072a4dd85fba9ea242
font_02_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 4712 bytes
SHA-256: cd5772d93f3ba36eb983bfcd471923feb1e7152b455224b7a5c9b381a9d17cad
font_03_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 13380 bytes
SHA-256: 375c524d024c7203d800111092a7a4e309964aa06a876a4875980e9059117075

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