Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaec2071c003218c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 21:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cb9b4c18c38398f08d645e82a172b0d SHA-1: 4f8f346479afbcdd42f6b5ccfe27e887e5a3679a SHA-256: eaec2071c003218cd989b3c8342ed706875273878a67c83662733fb88258c4c3
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 embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=best+video+player+android+reddit PDF link annotation
    • https://landbondcorten.com/attachment/file/8caa932494cc6f27ea856691754d5582.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/kotaginaburogi.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210901095758.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/10134949026.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/12506718365.pdfIn PDF document text
    • http://kezheng.net/Upload/file/jexevosubapulewebotojod.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/lujasizukesexavawefoped.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911011752_gb4cy0.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/zotalalob.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/mogurekewinetekaro.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/54975476851.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/ruzubuj.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/kidunopi.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/35004521696.pdfIn PDF document text
    • http://metallpress.ru/files/mibaxi.pdfIn PDF document text
    • https://mollis.rs/files/19008789691.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/83281418834.pdfIn PDF document text
    • https://mimpidia.com/contents/files/gibutolupe.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fe69b8ad938fec40073b47538fd7008a/zazelurinemumox.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0fea9d21---37064945281.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/ditilurovasiti.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8a3cda15---xegedosawova.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/sowixotobe.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/lavejatexaxagor.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/87f09rmkor0p5r8jpug6r7ku4n/xutorejagemokig.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_off0000bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 16812 bytes
SHA-256: 37b05c04d528575889a6353d1aa55a322538ea9a6bc20fb38bf723bf69838d4c
font_01_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 10620 bytes
SHA-256: 4d989c55e8d2c36d09e0c441e4347f2d953c1de248e88aae732dd8854337bb02
font_02_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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