Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9fd33cf723df25…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 13:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1022ffa9bee92a6a8b496099c52833ec SHA-1: 98d18172daa1407275b8b8acacf607b898c255a2 SHA-256: 8f9fd33cf723df25525fd8c6cf963564bc114b34a676167ee315b3f86b936078
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many hosted on compromised CMS platforms. The links appear to be part of a link farm strategy, potentially for SEO manipulation or to direct users to phishing sites. The embedded JavaScript is likely used to facilitate the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=industrial+wastewater+treatment+plant PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s5kvsvvp5dtvqrfron08lsc5i4/kesiwukafuwavuderese.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rpmbdf01745dsa3fukco747ga1/13733244823.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3f95d14165e164657a167c61041939a2/45020866965.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073df6ab9e82---madezabokuvimululu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/1qd5hbsk78uf7hdhf9qmcamgr7/rekofixa.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210610030057763303xx9yi6.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078eddfd6465---85859018836.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/50752177869.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858aa07678a---61734362922.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8l32753hb2t6573c57sc8d1c1r/71045182656.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1aridd8qhc9jv2tpchj28ik2b5/77543560751.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/xufanibi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/4534d870aa5e1b86376257871b29c130/zonanixovuzaxizev.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/zaxanejaximamadasure.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/917b97eb2efe174d7f9212eb931b5788/pozurad.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/tmj9rc3lddt64i225t8mm2ldqq/34901540197.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/bigebamodilupofebogiw.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/o8746kso97dqfceplsdn5cmsfe/78528849241.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731659f1a1a---migewagesilavoxuwenene.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/vapogaputariwifigimi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05f67f07c3---winotorilibesox.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ebf90b1da85a949f7302a4cc358ca37a/zonebusazira.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/m8e8fn38388qvtpka3t9jcu8s2/paful.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b57rosdm9ld7ptb45890l4u5um/suxubabotenulemigepus.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nvcd4jgfl6km0ab43e9u2vvg36/puwijeralalifewopil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 17848 bytes
SHA-256: 98ca03486c6e5f0d861c8351790b478b5ae989ea8d7e6a1a0920f07107b756e7
font_02_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 10572 bytes
SHA-256: 46dd9f2cf097f8871c8f4eaf2c7abe62c9f0600c66f2ab6d61a4a7787a53b744

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