Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecee3b21c7b97d7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 04:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d649fec92945d5ef5096bc6991ba1bb SHA-1: 2744df04a5ce94c820433b16e8f87cef0e49a5c5 SHA-256: cecee3b21c7b97d76daabcdf8ce36f30abd4ce87c5666371ca5899657f32d786
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it likely contains malicious content. The presence of numerous embedded URLs pointing to potentially compromised or disposable hosting services suggests a link farm designed for SEO poisoning or phishing. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomortiga.com/contents/files/sigutavil.pdf In PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/sewumexenezamukumes.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109170706427141.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/jesipugog.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-20/20210920063100261008.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1e6acc8d810b48d33fc4f7daf8ea4871/bizapagejopuzosiveme.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/65445857156.pdfIn PDF document text
    • http://masonhn.com/d/files/bipuwevemexuv.pdfIn PDF document text
    • http://ccshecea.org/upload/files/4645813543.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/55114989119.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/vilirevukiluxosapinaluki.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7h025sanpui4sgp2nj200r2bg2/33936409711.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aaaa6bf09---mefomelakumuwazu.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/murimobaliletilafelimeze.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/dupolifolewezifotofomel.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/jegegejoro.pdfIn PDF document text
    • https://fototipia.hu/files/files/butofaxera.pdfIn PDF document text
    • http://otczenacts.com/media/files/kivemutozasobegatugil.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/worososufirukogugevit.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/65568470141.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/pipimarix.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1fb8e3094---josupaxuzodojobimosagabud.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ku54m22imk6fi2if48enkfsdos/52580134810.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_115913.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/fezaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+whole+new+world+twisted+tale+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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 10660 bytes
SHA-256: f4e3998ef312403001014c45cac572cd149586032380a334f4e5d792cb92128d
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 17428 bytes
SHA-256: e16675ba2f24856f38265a08945f72eee55daa4117c2baae32ccee03d6694a4d
font_02_sfnt_off000126d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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