Malicious PDF — malware analysis report

Static analysis result for SHA-256 959cfd5c4849a15a…

MALICIOUS

PDF

91.5 KB Created: 2021-08-09 07:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 300317c42f8ffc8ad08aee125d3183b5 SHA-1: f4f2ee63fff0ea81e324a041ea8a9c153a7e0131 SHA-256: 959cfd5c4849a15a7ef3a7a43d2a1345d6d0e3a92947d5430170c55d171bc00d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160896ea3343f5---6474978179.pdf In PDF document text
    • http://mesterek.net/tmp/19942744373.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e12a0873897---88065254953.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/lojawewefutagiguxot.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc46e75172---wazuzalunaka.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/wopirerorujexesixuse.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2ef704a446ea7fb0b487ababbe60c23f/kidukonajujazes.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e78dacfaead88ef53f77ffd255af4781/zutipid.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad96811c4e---fawer.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9odeb4q499nrgt1bonfmitfos4/84276648423.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/tidofamoj.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/nifarafarefirodiluted.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xazatijot.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071d48603a6a---73033158747.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/faterewijapibulamifo.pdfIn PDF document text
    • https://hiroyoung.com/data/files/31351506699.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/86253025084.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/gutosodupiwuwitebata.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f233ab6508---17620245549.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ec5e0ff02d130e3b47e631bd9c1c063d/82323170077.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/42386830125.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/96935818990.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/seroled.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/806af47ef9f5b156859388e9a73fb2c3/7021550002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+fix+samsung+twin+cooling+fridgePDF 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_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 18548 bytes
SHA-256: 21b4539b4ec47d8804d00d3063772665f4b1166bf0d1b61c942e115061201e19
font_01_sfnt_off00012cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 11100 bytes
SHA-256: b834ac01c4ffff6157c21fe745759606f4a299bcc7fc3693167611b4d7cbf594
font_02_sfnt_off00014677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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