Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa86330e6744a74…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 21:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad986176b4b9a71e3d2187d4a4fb2d84 SHA-1: c482663637ac72cf939525b8a5c18c164875c53f SHA-256: 5aa86330e6744a748d67bda95850fea2a4b6b97828ef01f0f413e821229252b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded JavaScript and linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=treaty+of+london+1913+pdf PDF link annotation
    • https://a2designbg.com/userfiles/file/wuzenetode.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/gekitekabot.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/10845801383.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/81587998847.pdfIn PDF document text
    • http://licausi.it/userfiles/files/75286947454.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/kudixisimet.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4943eea08---wesezujawebekiziloxa.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/zevinuninigixonowivugo.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/95516978087.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/jugakavi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/vndpfc7ckom2mskh11i8o7rp13/32647430671.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609905a825bda---87078800678.pdfIn PDF document text
    • http://watch62.ru/files/files/tisemitanopi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf378bb8c---93913648040.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/14442265936.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a88b133e0---65413517664.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106721493b7c---68661312032.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/pufopikuruzo.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fodugesekuripoxof.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a7850395d76ba727c9dfa6d894ac831b/madezixojoforugu.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/86389745068.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_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 23164 bytes
SHA-256: f300211ec2a07a7cced43a6283e21097957881d438ad4e2fa5adc579dabd985c
font_01_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 10700 bytes
SHA-256: 07c6faf9c0b7b2a68a1d4e1cc14d2760896f5d39b0290485d1439a30b92cb0bb

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