Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc8497cc516f60d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 07:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94a8dac29b883386fc838ad1305f1224 SHA-1: 01b36af4af48dd89312abbf9883fe519791de1e5 SHA-256: cfc8497cc516f60d56e9808dbe1db48aeba47e10856df4d869a75ef3b5531d80
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and a link farm on compromised CMS upload storage indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wanna-drive.nl/files/File/79951639682.pdf In PDF document text
    • https://termoformat.md/img/files/valonobejavorapikemikijo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/24df3732a76d74d34cc651e9f1626416/zameniwezutotokeboraxim.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/xitotokep.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/vulebefapasedufositadatos.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bbd9b73f636488d48cbe21b7955330e8/mujolikopes.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/28397882876.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/62898efcec26fd68fc9a0b9b9b902eae/rimobaninunutijirar.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/zadimajobuwiwaduloxuxenil.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5030aea1---32691157203.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16146ce9baaf96---zivizabetirobujewow.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_221616.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/212f37d9f05d5c13f7ec55d51818abba/joralin.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910160611.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/565b9031c78bf9ddabab0fabed6872dd/86665328049.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/towegunutotabetoxivadok.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xipilulam.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/39283658789.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/9559581241.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/wagesebiwuguv.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090517535180554.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/lawajowufafabozajosi.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/ratopanijodof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+firered+master+ball+cheatPDF 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_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 10972 bytes
SHA-256: 7f18e841c994cd04e9b0deb1b4397b10602195bfb6d229b21b98c5dc6ff54345
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 17572 bytes
SHA-256: 341fefca4b14b691f5ff8f134608296c95e28d0660852b89cc587e6ebc93d730

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