Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cce718f444a3f4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 19:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be331872f6d993d8f1649a8c54727351 SHA-1: f11bcb2dd1f275e402df5c5b797c73decefeab23 SHA-256: 77cce718f444a3f4c292159ab045a9f72ff46986c2b2d1a60afa30da8b4c7962
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of multiple unknown PDF URLs indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/731e6d819dc86fa72047630002973b6b/sotamevoxutilojel.pdf In PDF document text
    • http://galenbio.com/images/upload/file/94185767053.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/87962582331.pdfIn PDF document text
    • https://avela.md/userfiles/file/rupusezajuxilotozekojo.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/63282677835.pdfIn PDF document text
    • http://theponghop.com/upload/files/ligetevudemuzuda.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/99514977173.pdfIn PDF document text
    • http://www.polni.si/Images/files/34780405585.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e0b47183e2dfd7937d51ed3d7d01d223/bitabuxosagedigo.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/beledavukuwekofakekisu.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/vitenufegabejupekejexewe.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a17aff42925fae363c4d823c6355c0fc/83375295739.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/sefotapax.pdfIn PDF document text
    • https://melz-feu.ru/upload/nekuzivisuwumun.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/karaz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/pokivatotamokolelax.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acbb542ecb---ximimosunadufir.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/8519267986.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/jazevopazaxugutatogi.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/negiwubezifovudadijutezo.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/20308809681.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb472559d5---28064154245.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/090e83008ec1a34cd38588e193942a18/69999833122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=game+offline+ios+terbaikPDF 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_off0000b613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB613 18084 bytes
SHA-256: a6515105a2d8b56745e2a454aa72ae0de9d830d2d5c8727251c04ae1449617c4
font_01_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 10648 bytes
SHA-256: f55c419151f14c68268a4dee3f0c089aea397d918f1c4df429ab25200fedb90b

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