Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e499f83e4a36ad3…

MALICIOUS

PDF

121.3 KB Created: 2021-07-31 13:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 261cd447256e8ee3daba7998e5e0dcae SHA-1: dbb9af8a8482a4477133c61f66d30016f87ff2df SHA-256: 7e499f83e4a36ad31e82835cefae9c966aa3117f57b3071d84147b5d1e1edee5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to redirect users to malicious content. The file's structure and URL patterns suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=game+theory+bendy+and+the+ink+machine+chapter+1 PDF link annotation
    • https://electroagro.es/pub/files/94546395507.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5196d0b49---nufonigenekaj.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/4gqio6sqgotmplv69ts9ish93q/jefibifedigabagepe.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/sunovinuwuze.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/17375482505.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/64ad00db6f9e1e15bbe8fac3ad7dd14c/nitikatobirefenenoxobobe.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/111429972.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16080d35e7c955---rizegoboxol.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/96332359285.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/runanusanapebotiwo.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/vatujafiwud.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ocn96sai97ee0474adlk7cjdkv/nudajagaluluvibuvikuxam.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/bilaxorekikegojo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8f46d4a8---lawudusirilikesivezum.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9ae16bb044932336f4bfe800e776913f/nenikufuw.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/95267342848.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/kobowobumiguxaz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c42c1f8e360---kozedeze.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/16479937392.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/95386866509.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/d9ijdmpa5ep4sm50o0bd2geqg1/gigetanutubupi.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/nudotonav.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ea7708f8---vaxebexewudonafitew.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_off00017331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17331 11000 bytes
SHA-256: eb2d70eb8887271ccc081a9154e42a46c095dd9dd229b2ff46a2798ff5032a0b
font_01_sfnt_off00018c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A482 18980 bytes
SHA-256: 47ab7a89da584185d57900520441b59ee8a99c9e9c5d013c5a2029ae3532dac4

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