Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07fd27ee5d80089…

MALICIOUS

PDF

76.5 KB Created: 2021-07-06 14:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 533e13062c7aec05b2319b960a396839 SHA-1: d4ef9d069e5be903a30cc5b35c600ed30313275e SHA-256: a07fd27ee5d800897cc767a540aeb0a13601cabd5659da1f1a10aa9cf40733bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=constant+rate+of+change+worksheets PDF link annotation
    • https://bamor.org/userfiles/file/56087484179.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30b6908fdc---kefexifisorebubozoxa.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5aj043csnonmj8fhmnk5kh0oe5/18590149273.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/cec658c31e74e29d51a3d6e29e22c3f8/73052421005.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9dcd4a3e2c4c864ede50e76c83bd269c/bixefodol.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/89259974956.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/pufevijarug.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee5fd85f07---wesokonep.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606de1619839d---ranoxudirisezovefiwesub.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0a4e37a3e9c45674ff17912f85eaf8df/nabubupatokalavejupamoj.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/mijefepepokevaw.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed312289f---17151528061.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7geqct1epib5ujnvrmn8m2b2b0/63150517831.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/82276090081.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e584f6e70affb63a3cf1e2723aca81ba/92176039283.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f3081deba---foxepadojakaxekesikuta.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/bosubukodotaxilakowawelo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4a07b7f27e8d2193f44288c96760a979/migabamemepexev.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/098bc37c796d432d2273f6f1c8a3078b/75062872695.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/p0b83tp0ltbq4vn2it6p6f4c23/watifex.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c5c5d0a0bc1b93aa36d433b19bcebba4/kekegefiwavipodawaxoma.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971d8baa616---kajodopemalow.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e5a03de4e---85782687783.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160987e922bcce---xufisefazejivinupugik.pdfIn PDF document text
    • https://neplatnasmlouva.cz/soubory/dagupazelokimilu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5940a7374---galomodapixuxobagogegukan.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_off0000ca16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 16224 bytes
SHA-256: 30de5de5a954a422c013932b861ba1951b1d30fa6f7186bbb8e5e2641cbaf395
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 10688 bytes
SHA-256: d3ecec9b63ff73f480923061382b1b253452c301d477f3fe66729a8066228a2b
font_02_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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