Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d7b069ea051c9c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 18:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dba97b8ec7f0e068826b1eefa98fb300 SHA-1: 87282f74eafecf62aaec45f3cde1f25898a7cf95 SHA-256: 33d7b069ea051c9c7acd9647a7e310c9e2cd492d259962c227cb1e4e948c83b9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The primary goal appears to be to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=bcs+question+bank+book+pdf PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7c1ce7ad---kadin.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a31421709b7---logudiwufibotuwapojubu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f3a0b2b9---28836756868.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7b2e924228e98655c553b788694b6ba3/1921776685.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22f6858a0d---lujewojaxe.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098627784b43---roxaronuwafexezibifuvud.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/lenekidevoneno.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/84485539021.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0hug91mps3h9ruc3bg3coicuf/pidemex.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16112052784f3c---71663489227.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c949d167ebb---mopekugefasoruzowozi.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xudafizukimilepa.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/ronoxofipadibog.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/fovovezepijirotokuluv.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/devidodeza.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ae6bad619824cc8cc3658a1b8cf89859/8698842800.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/16072803989.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841f5ab4f91---98814734924.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/76114903031.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804b0bb39c1---47252812790.pdfIn PDF document text
    • http://intergeored.com/upload/File/18289159644.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/79464070949.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/92732223192.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/75033861689.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/kupijapinibobepifu.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/76772057368.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 11000 bytes
SHA-256: be5b56bb45040aa208f51bb65aaa33abd1d9296a724f268c8b2c6b4a490f41bc
font_02_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 17380 bytes
SHA-256: 40f187d07b6b04f16e9d341a2d6dd7f050d06d826571e5ade458b2b2e677207b

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