Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3795fff16ca1fc2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 06:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d389f814ce2561c4fb391c63a5c905a6 SHA-1: 10b734554b181da84cb76cc1e3f5394288717c2f SHA-256: d3795fff16ca1fc2b9bac0fc285e26d4e1d7b95e3e6ec8b6b32dd852632049f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=descubre+1+textbook+pdf+free PDF link annotation
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tbf5c5fd6vnm84hu6jluub2t2c/mudidoras.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/lonajevuwol.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/58909397954.pdfIn PDF document text
    • http://debden.org/userfiles/file/99095121062.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ce5dtv4556llccplb49o97t7jl/wotavi.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/96651100225.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/kibemu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/70a9040c751e4adeaa42ef30242c10ba/59794693915.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/nosipekawubuvato.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6a28dbbeb0a51a2dfde411025ac160a1/dodopewi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fde3c96ac---jarujewakitaxosizifevap.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3ca587a7---pexajukukalap.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9a9fce2b2c0c81b7eafc715b47701c7a/piwavimumubiru.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/8tau33ek7g7glev0n189q230tv/13825010827.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/032313533278.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1b9b58ec96e185b28b50f0e2caeb6bec/gedunitumisukadej.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/07a361d51cce7f173441844072366cf3/simatotamodisivevokitup.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/42924968629.pdfIn PDF document text
    • https://777mto.com/contents//files/2914645050.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f9fbc3b1---22828839334.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/novoxas.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/kimafelimidenowoxunovadi.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/zekuvofejobugurupokozepav.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/mosowasotomuju.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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10696 bytes
SHA-256: 05f2319902afb079577c9c967844a75ab848a3db074819bc51dd6396ce04d73b
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 19184 bytes
SHA-256: 580d32338d4b0ead4b352a22f1e1c7bbba334351b02cbc42cae7e6c7978577e1
font_02_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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