Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8c19617d7d9347…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 15:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d05d9e29832b6301aeb77a2278347abc SHA-1: 6b886514fa7f7809145cfbd84708b7f3530dda37 SHA-256: ec8c19617d7d9347df3dcb1d78e6f78f6e3e995612694e0164c6f0eee2d21787
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://akcjonariusz.com/UserFiles/file/vogabekopiposiroroxaxa.pdf In PDF document text
    • http://antifftech.com/uploadfile/file///2021082809195947.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/bolizevudateboxoxamogeso.pdfIn PDF document text
    • http://rayanchem.com/d/files/99838973566.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/12809422256.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8feec4896f---gubozejivujuditu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/77020a9c8143364e08120fae761b3145/vonukowiwonixas.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb131b80a8---89081866322.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/sodumogivibe.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/74239945441.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/gokigofori.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/50428064797.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sasafileligov.pdfIn PDF document text
    • http://mcutech.net/files/supuva.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/cc5obtk2moulf77da5tul6q8f3/61518469051.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160903ce4504c6---68289077489.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0da05768be---50781550557.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090088e76b1e---71496176085.pdfIn PDF document text
    • https://xigmatek.com/upload/files/xudexavugawesefeweduzuxe.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ffaebf52---kedumizuwogadofitilif.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8698f15dd7145f0976b83622c29fcfc4/85732400469.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zaginomivalo.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/gafivabuvuwukajewidut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lumix+lx10+owners+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739428a5caa---66501633815.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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 10588 bytes
SHA-256: 586046c174c4963cce00dc9378851bce56188e79f835b05df2c88aa9e03af8ad
font_02_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 17460 bytes
SHA-256: f39e2ebcd5dc29d89f340599676ce89f9601d5715cdbc8558f85f4e3e89578f8

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