Malicious PDF — malware analysis report

Static analysis result for SHA-256 f923ac4604a70289…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 23:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1766119ff0b5d294298b908f56633a6d SHA-1: ddb71abbce2713a41c0d1586d28d17c0ddad07f4 SHA-256: f923ac4604a7028972b3eb3ba1519ae4ab9083e611247619ccdc8e7c1c4dc4ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aspaeng.com/files/image/files/11776018357.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/3642441896.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738a85a6442---jisafunaxire.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accbd1300fa---8035758727.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/63904306480.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/sutemawamomijupe.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/vaxafebiwidijuve.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f619eacd4---84127422860.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/karomegaraladozexojixeti.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/51812842059.pdfIn PDF document text
    • http://naucseto.cz/storage/69447537831.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/05ce7ac2f1669dba9364f398728530f6/fujalev.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/13015989893.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/47773642893.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a197d3303---21890195149.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/romev.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/40v7q2hpa7btphitqf8qurusn0/15772259125.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/19944421553.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/87682812204.pdfIn PDF document text
    • http://93564497.com/userfiles/75635073035.pdfIn PDF document text
    • http://reopen911.info/media/file/ratirolovigifun.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v957dnq4ie53cfc1d7ussc7s44/fesosu.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/2884387465.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/mozegumemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=psychology+of+love+sigmund+freud+pdfPDF 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_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 18812 bytes
SHA-256: 51a195a75c39af7192936d6c9bf54ad321dd4c5a463b22b70c0900abd4c8f0ee
font_01_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14198 11088 bytes
SHA-256: d4b2f32faa1a93e7dbc32b588910a440419dd93229e797f6473e3bfe1808a656

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