Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc464c0b73e7f79…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 21:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35c1ef70e8950248064e23810a4e98d1 SHA-1: d97074c563542b6d8ef7d7feb43a767a5da3962a SHA-256: 0bc464c0b73e7f79a6f3c0f4b1bf0c8ac2dd619e868ffb25a38e236a1ead7654
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161317ebda7a81---43003556242.pdf In PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/visebatugegupojipanexiw.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/85744935398.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f0c6bfd059be9ba5eb1a4c9545d00574/68220926999.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/56892562701.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/460dbc44133f41cd2f5fd03746cbeb7c/21599101883.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210903_63D74F7BDA483224.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/pizufofoxanewulenuvo.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/4970411938.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/79752088539.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/sowupolik.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/26785902237.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109010837507678.pdfIn PDF document text
    • https://photofetimages.com/savilum.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/tonavu.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/dirojuxudomekomelazel.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/vusixe.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/932be2eea889eafcdef53254ec9de648/rawukipulagusefuxejupoden.pdfIn PDF document text
    • https://ever-progress.com/upload/files/lepuvawumiwe.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332a7c992dd---bamevajitukof.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f91c66ca8e120cd83cfceda6c77f555e/pimafuridobumazubizisifo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e4b4312418ab9b019a6d77010c52bef3/zisigi.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/kexezuzomokorimemimano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+browser+for+rooted+androidPDF 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_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10580 bytes
SHA-256: 37411b451a5279f005554859c41e6c44fb2607b00aaf9966bc5b6b5994b6c6e3
font_02_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 17488 bytes
SHA-256: 057a85a90cf63ebaa5d08cea935e5e6d614d852fb74285659ce28e2cc63d99cf

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