Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d38a4559f3ecaf1…

MALICIOUS

PDF

106.1 KB Created: 2021-06-26 06:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e159125f9120e4511e3df002c00e3cd9 SHA-1: ecbfb47e03a7a24b5c6f3c74d864631333e6fa42 SHA-256: 5d38a4559f3ecaf16abd3ef035ebfdf4b9555e0594aa3e284d374126d546bca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm used for redirection. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing or trojan variant. While no scripts were directly extracted, the nature of the links suggests the PDF's primary function is to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://nomylo.ru/uplcv?utm_term=what+are+damped+vibration PDF link annotation
    • https://agermag.ro/mm/file/24154043708.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/df750d117b820fc8387f39235f443dbb/vamufukakili.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/70937708009.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/nevixuwisoposavo.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/foxetiwobibimadejexozisaw.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098956e672ec---lewisuriga.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b29594d5133---savobe.pdfIn PDF document text
    • https://bamor.org/userfiles/file/fexuzo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a079f80b3ae5a3e21ade34782f991935/7301420341.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/duvamimujo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2637t226n5kh2l1ce9sdu4aeod/jukasiwusosesimol.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/33922163521.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/nexasilobe.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/wudafere.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a000c01841e---newojimalibogije.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/wuwegojadasaxoxarem.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/vovojonebuvipotigovoxere.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/55a322ae91a3e9f25457a293c40da2be/52301038347.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608784e787af2---90321397960.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba483093ebb---dezatoditavejifabatumev.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/178e3030c40fc6bb6d3281fc8cf6b5de/simemugazawufuluk.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1ddd9e5d---domujuruseloni.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/36738065554.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_off00013b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7E 17680 bytes
SHA-256: 68dd0d04cf957f8db1f599e7e3b5f1c5493225f200a6affd94b3eaf58f07a7ac
font_01_sfnt_off00016a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A0C 10644 bytes
SHA-256: 0f4f93cbeb1211a1a6ffc04aa028356d2b263f94810e51fac66ddff776006f1e
font_02_sfnt_off000181fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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