Malicious PDF — malware analysis report

Static analysis result for SHA-256 3500f78f646b5afe…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 19:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00849711ffec9a65e2fd59cb6e1f561b SHA-1: 3c78877fbc5a4792ee29483afd432586600d7f05 SHA-256: 3500f78f646b5afe438780a404a0dc9494026993242f13f00381e95e1e34c6f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of embedded JavaScript, flagged by heuristics, suggests the potential for further malicious actions like downloading additional payloads or exploiting browser vulnerabilities. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=dead+target+game+mod+apk+download PDF link annotation
    • http://gardena.crazyrockinsushi.com/uploads/files/71084482449.pdfIn PDF document text
    • https://orrizon.ru/images/file/29599776418.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/32451414381.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/xudowijiladelebazuxokefu.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/ludanudamemafabem.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/xitajimeruxonumib.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rv04k9nhmct3aj5v9en2i79qet/45307586113.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/7162401586.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/f7efe3ho48a3519ac3rokhm6b5/77902922151.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xomakenuluvegu.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/90156646865.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109050454397326.pdfIn PDF document text
    • http://toroisg.com/public/images/files/majodexazux.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/54490473521.pdfIn PDF document text
    • http://badgerhillfarm.uk/kabomaxo.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/13954157323.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/mizajadimixufu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c8e31990---domive.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/85393041446.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/wazidisa.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/7911969764.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/vevifiwotipadarojozibojox.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/balotununijesedufida.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 10656 bytes
SHA-256: 9456b3ccacd7846067b8ab595df9deaa0aa019e4c5773b8aab07007f502eee80
font_01_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 18608 bytes
SHA-256: 6287a4c83a736ab7d7bd7882005fbab39f845e170b5fa0fa91795ab83fcb4ad6
font_02_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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