Malicious PDF — malware analysis report

Static analysis result for SHA-256 889ef30b37374de1…

MALICIOUS

PDF

82.6 KB Created: 2021-08-25 12:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c909c18b97843a7d55aacef27a9735a6 SHA-1: d5d45ea316636049057246ce5454cbf4b3603341 SHA-256: 889ef30b37374de18bf95c9f5ed61a121a506f2c8f0c4d96454fdc46703cff4e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution attempt. The document contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an effort to obscure the true malicious destination. While no scripts were directly extracted, the nature of the link farm and the detection as a 'Phishing.Trojan' strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nilsahost.com/calisma2/files/uploads/pusojixudazexinopezesuv.pdf In PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/digebimaxixukasezivotuke.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/24055829498.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/55344324459.pdfIn PDF document text
    • http://webbuilders.com/files/file/setenuludedewakab.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/jibafa.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/50860629729.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/mitakujoke.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/robuzanegutofunabugukeduf.pdfIn PDF document text
    • http://canvangdientu.com/images/file/97314004370.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/ratorakujeregux.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/kri45j7vi9kccr0trmo056mbv4/zejamuniruja.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/hd3hbehluk7u579g92mt8d8vp0/vusamabeberevit.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202155203382897.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/zapuwelan.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821aa24438a---fatadujigu.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/33672414299.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/19150284952.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfc70bb46---nezowazirosikamutijobum.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a149b1bdc7c---topazofuxakatiwaginiwupi.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/77809035634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=salient+features+of+american+constitution+pdfPDF 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_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 10956 bytes
SHA-256: 722c740736efb87bd081776080ef20679cccaa5bbc3e2d441a984545d115f758
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 16648 bytes
SHA-256: df0031d60d74946d4ec0bf2c2da958fbe1774a9478af767da9f0dedbb2d6859c
font_02_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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