Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cf0e24fc45217b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 11:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8326a3d62c73d9e734d256dcc080903 SHA-1: 6870476e0d476d61f9dfc9cf2fd01fcdc4b6fdca SHA-256: 71cf0e24fc45217b31f6fcea02b39187fed930d1896f5a23deb53d29b40a0330
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ciaooo.ru/uploades/userfiles/file/7951614537.pdf In PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/33519335831.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/kq1su438kreud6figknfg9tpsc/sanogadamak.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/nugif.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/fejebutazev.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/98106963185.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/puwukujuwomijujukibutomup.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/39095909566.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/54602619661.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/83416703783.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609abea581d2c---28213910512.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/vapanexobexuwab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b17b56ae6---46177814437.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088f78a3041c---80195430016.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210814051810.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/nevojebovomedap.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/dilemexomovaxin.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/m1hl435mhlh9p4fjub87rhmlp3/91804063833.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lexurepimidudut.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/rimobusewelajudijexej.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078126f6ca5f---wegoxoveleg.pdfIn PDF document text
    • http://accronline.com/userfiles/file/28670721849.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0253141ba06e8064eec6fa8e945bff91/xowujafoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+police+in+america+an+introduction+9th+edition+pdf+freePDF 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_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 16876 bytes
SHA-256: e0d618509d8d4f8c05f3022aa27bbff0f7766be0ecee99a203c7ba4bc17bb502
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 10948 bytes
SHA-256: 6b78f8f4222e76c56325e874c011ab4b1ac8f689ea8be67be48601e6736424af
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1