Malicious PDF — malware analysis report

Static analysis result for SHA-256 a387a723b19b7f03…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 03:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c9aa1b3edc81cd7d97b659204c48eb2 SHA-1: 0b178a12ce115b531fc14c50be38202fddb84b93 SHA-256: a387a723b19b7f03de82b4a18c69a1c778021ebc5cbf99b03c0e60f8f24f7c86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://garglob.ru/uplcv?utm_term=minecraft+one+block+map+download+android PDF link annotation
    • https://eletvital.hu/uploads/files/romejejif.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/xudikipiduvu.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/robevovomipujelenigaj.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/damirofenekagos.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/liramogikiperilu.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/sezezufamuwegoda.pdfIn PDF document text
    • http://getvisa.ru/images/File/judosagadesipilokikijarez.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/risogoxuvozowabapukigopu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc0e4d2861---2171144304.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/41653895117.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/bazijujozamumaluj.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/42390259856.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/modimadoladesukogakusifo.pdfIn PDF document text
    • http://unibox.lv/files/text/39465911824.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/600124732.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/mabasopitotirotujakidel.pdfIn PDF document text
    • http://apvn.info/userfiles/file/zafizipakaf.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210923090841.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/06d4ecd10d8034720ea2629521fdbdfe/85686611078.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bb4ee4d53---68986124679.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/81784671024.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/nuzefevisizosisog.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/16260497873.pdfIn PDF document text
    • http://skisun.it/userfiles/files/86127327584.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/9958319674.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3e061618---sixurevamazej.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_off0000b503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB503 17792 bytes
SHA-256: ad8e7330f0b72219c974b046d8261d9fdb066cdf6f5973bc9ebe929da5706f48
font_01_sfnt_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 10924 bytes
SHA-256: 20eea179fd997aa0fc463c00df30b6df0a01ba5ddf3b6659fb54233588272519
font_02_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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