Malicious PDF — malware analysis report

Static analysis result for SHA-256 f550042882fbd342…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 10:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5eb4e24fd10f701960853b067edfe35c SHA-1: 97550b5e7b3434247dc1fa86dd23b6db24508be3 SHA-256: f550042882fbd342c9a2fa1940c8c0b5053b3d33db9c15815979624b00a75a21
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing a trojan. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cahayaapi1.com/contents/files/wexagekogoxirumabin.pdf In PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2ea6772e772b62b651c0e8bce75ff583/66876031579.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925c425b250---temelulilesokejopisimup.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/fulikuk.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/34029696482.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/86143543656.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/gifomaxoxuwuzurezomelogub.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8d8569f24---92783896100.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/ravovipefakupurix.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/tidedutuvidilemakunepupo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/19888843777.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/96057387378.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/xutufivatusekakafejojaga.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/voxufu.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/gebarenokugixivonafo.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/69467721706.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871e38508b4---fazofifumezomepidak.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/susuvolululifow.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/nopajoxusatekejuxam.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a032f57a8a---jufoxaza.pdfIn PDF document text
    • http://hangquangauto.com/files/41479130479.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/xukugakapabifijufa.pdfIn PDF document text
    • https://e-midas.ro/files/file/98063038512.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc226cdff---59267220895.pdfPDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/88e18c38825028c4342211319b7c0e89/12238705639.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/62065238800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=up+police+answer+key+2018+pdf+downloadPDF 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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 22028 bytes
SHA-256: fdac5d9ff8af4f59b1ce715737b02b8e9121a8c3ca3f833ec838674bcc895f16
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 11316 bytes
SHA-256: 716b636181a8f84d8a71337fc842c12ded4b1bfe056d350ae0839d6ea48a944d