Malicious PDF — malware analysis report

Static analysis result for SHA-256 510099609191154c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-04 09:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77f6748cdd0e7e58df985baad6186f4b SHA-1: c9288f12cda5ad6cd43f858c7912428d03a90ed8 SHA-256: 510099609191154ccd6fe256c25a2a33cf6bdb6a070728ac672b184ba0da8e4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to appear as a free download, specifically mentioning 'web hacking 101 pdf download free'. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to phish users or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/659690a188c04b4d09303d55853f4055/fudutemegewadipogidi.pdf In PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/rokevuvelodiwapevuzane.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/semora.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/fotonefexevipuzotewafaze.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/ramoladan.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/vutapuferixepek.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/pujezederowedam.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/43636582991.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/wegemawaseribufufe.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f5216b4e39162d85c52efe9d5e6739ad/xurufinumon.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/k521abgdv2tplh722v5l325e57/445556722.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/lenovedosotanuripa.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d95800fbb9ac2f5a5626cee4b28b4378/18440094752.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/62615220689.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf076c3a8---dukepobeganamarusadi.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202106155346_962090630.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/6fkmnqlglbbt76fhlrrqm73f6q/96370602888.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160caff2f3f700---kuwoxonebinudokazagefu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/cc90ca06f5727c29266c55e38515fb86/75778505885.pdfIn PDF document text
    • http://consade.com/userfiles/file/fupolidoresiduba.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/zakoxobaniladezo.pdfIn PDF document text
    • http://imi.vc/upload/files/77301975321.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/56537893874.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b801dae8d3e---60715826674.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/67111273440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=web+hacking+101+pdf+download+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_off0000b2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FB 14720 bytes
SHA-256: b747cb0fdc5f7224ab1695eb67f2b80b25a5294e3e90c78a759f827cbd1f2ac5
font_01_sfnt_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 11116 bytes
SHA-256: 85803f5311e707eb1c35f229725e2454a8cd9a9fe374766c8b91a8df4c5a7403
font_02_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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