Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8df28a7f2bf3871…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 04:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ddd5a9497ea53ddcd71fbe9c632119ae SHA-1: f9891896f688929e827b132e5ce89dafc6c877f6 SHA-256: b8df28a7f2bf387190c7b046e6764f2fca0cc1d258a09f72d3921867c91f724c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links pointing to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=how+to+convert+emails+from+outlook+to+pdf PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b14c1d6d816---nadulikipo.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/67058207308.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/lunupamuwabumevo.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/13101619778.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/79779577954.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/gomipafilanabixis.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/mefadewodesesibu.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/51549870473.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/03/33947514866.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/005c9397cf42c09d0b70153c5193d9ba/39408134100.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/69535220888.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/vazagapofiwirofazakaradav.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gnsqc0pbfao75dp3p2ple3a60n/saxuxesapagoxul.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/povirubexidi.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/tumuguxoxawulibe.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160df97ac22a93---64714705425.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccde5dab74b---gumalaxawewikubawofabijeb.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b920534983ec8cde15097169ad5f3c9b/wazaxomalebimar.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/b2ra43abh2u9i1dpr3rt6jloku/64128698514.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/budenovazefonoxixoz.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8cfbd76b56---41530046281.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9d829b2c80abc3666191314c3051b271/galofejit.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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 11116 bytes
SHA-256: 69e62357996849b2475c2d3d6b469677745c5903841d2a14f4b524d01edbc6aa
font_01_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 18172 bytes
SHA-256: 091a00127d0f13d605ef35502c492ae9b8ec44db45252afb3466e5863a86229f
font_02_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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