Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf4848166513faf…

MALICIOUS

PDF

90.4 KB Created: 2021-06-28 14:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a8163820a53b18d14d4c475ef0508ef SHA-1: 70260333b7ca3fc5f8729b38d4bf2d833c3803a8 SHA-256: ebf4848166513fafd9fce7b6d1c8dd480ad5ff1c78abaa0c5f11c21b7b8091ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://huntic.ru/uplcv?utm_term=fort+lauderdale+things+to+do
    • https://chokysitohang.com/Uploads/userfiles/files/76850170833.pdf
    • http://ngor2-3.com/file_media/file_image/file/zekofazofum.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b600311464d---54780799605.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9cdf96d69---33720805985.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/l8e0ie0nfvb4g3n4f58iojdsn3/ragesip.pdf
    • http://madonnina.info/userfiles/files/nutenuwiwipufukira.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607231da5500f---98044222981.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b464c7aabb---77697415344.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5e0b844f---xijixekuje.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfafabd49---65169357032.pdf
    • http://onlineexpert.in/userfiles/file/jebukokejape.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c0707070---73329142221.pdf
    • http://amoy-art.com/Upload/file/fageluwivilolutopiwilema.pdf
    • https://ferdavagnar.is/images/fck/file/divakokixeve.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608710e35472b---ziwukejoxu.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/dcf8af7d63dd7af52f185ab71b3b633f/43042425704.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aqofagse196vcbpgu1ntgg50r1/rizekanipupawomosivil.pdf
    • http://stlnsk.ru/uploads/file/nunarekuti.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tjlantnu7t0udbko8287d189k4/gemovuxaruliz.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aff3279eea723bc941f19ef7da641704/53581401221.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608027bd4ab9f---22906517007.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6311d5b1---wupove.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a881a3884---ribupoxo.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5abf27469---bodotubefulumivanetegun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16792 bytes
font_01_sfnt_off00011932.bin
281c3ab818dda10e6fee724bb32997e961992c1ba40891c63a923d955faefb63
pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 10604 bytes
font_02_sfnt_off00013116.bin
214bbbd7cfc96b53ac1ed92c1b4a2beb4ca3e2f5f5b6b70cfc31bc6c87af758c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 16868 bytes