Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6cbb75f957d583…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 05:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f41e3c5514ba8a2f259951ccbb6e320 SHA-1: 9e73f73532a50ea25bd2c0b970e6515bdba7e3d8 SHA-256: 9f6cbb75f957d5834dfd0c271fcfea68fe5fb6b51956bbcb51a7c2cd79212c46
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear instructions, but the presence of multiple links to potentially malicious sites is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=testi+e+accordi+canzoni+napoletane+pdf PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/80au9ic480c9mud79biojatggv/ziromusozipakavawegowunu.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/mujirutitifivopebo.pdfIn PDF document text
    • http://candientushinko.com/images/file/23382812517.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/70948959441.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/nuparadigixiwexozumodez.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f98287ebb39a6915e7024394ae840199/73966192796.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/75195931190.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cfh97e86qguo64kva28927h1js/gezejajojeb.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/kenalada.pdfIn PDF document text
    • https://bataretak.com/img/files/file/mopipigefoxetepasedakasam.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210821080224.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4141e70bb---19741350749.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/624324572a16ea0211dcf597937af63b/vutawobofat.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/5491204041.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb4d39b1d8---fubuwerukup.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/vidun.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cd0205aaa9c6d0bfe181cab4ce7af33b/gugoxomukatuzorobaliv.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/74603703056.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8om74p8ndap86b1fsrb84khnsk/71000134329.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/lilenerupamadoti.pdfIn PDF document text
    • https://airshow-bg.com/file/74133658023.pdfIn PDF document text
    • http://strap.sk/uploads/file/xepepowonufatavet.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/20246202302.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625883716.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/60140076302.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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 17968 bytes
SHA-256: 44588406cf92f4dbc23299a283d8bf298114c88adeb0a2d06bfbca2223505f5e
font_01_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 10636 bytes
SHA-256: 6d3cfc84b978dfa1f62b1ec6dc3a881c1253c60eab4170093b7beea22c2b31ce

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