Malicious PDF — malware analysis report

Static analysis result for SHA-256 f016320253d7f420…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 01:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8b950ed7e5e068fbfd4af0a5377203e SHA-1: 5c64004927b2c86e9dabf4bda38c8d18fb6db5eb SHA-256: f016320253d7f420e72e9a80b57e5c51f8edaf0394e4f555a7b65e8d80234f4d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a malicious workflow. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=how+to+convert+mp4+to+mp3+in+windows+10 PDF link annotation
    • http://carscaso.com/js/upload/files/nuvufukawupojevawifed.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab2a85e5d---24947028784.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/laxipixib.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/65997986338.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/tiribavuxosesazugu.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/64963248628.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/mokufujenifutafikogid.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/kovimulezadelafazonoxigu.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/3625679701.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/duvojegubajenodefonabi.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/15328701738.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210920114848.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/povude.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i857qb54mp9e38ssu95uqkhsmt/kovuzegisibafupexe.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614723a756c47---76913574306.pdfIn PDF document text
    • http://quetthe.com/upload/files/37569269007.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210907224645.pdfIn PDF document text
    • http://abnicum.com/files/file/26036207936.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/76866020012.pdfIn PDF document text
    • http://ssp.by/var/upload/fajusuxuded.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/zerelifo.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/68662698962.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/835d04f06267714751964c152ef3a483/75110434900.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_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 11036 bytes
SHA-256: c69bbc18309c6d44c9df68d30505e0dd1e42c356242cd66f608c76c504e2903a
font_01_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 17968 bytes
SHA-256: 0584b169ad63363c76cf01e4fe0b76446382b3c80b5dd3be0bcee904f4190056
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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