Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5a1ddffc6ff61a…

MALICIOUS

PDF

74.4 KB Created: 2021-10-10 10:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e67c43207bc925dff672156f23ab419 SHA-1: 4e5eef1214417ae4603d8987e4a136e46232ecb1 SHA-256: bb5a1ddffc6ff61ab2e497d768898cabca7affee0fba53dd7b48b3f3816d0c38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect the user to a malicious site for further exploitation. The presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the use of scripting and link farming for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=low+water+immersion+dyeing PDF link annotation
    • http://maximaviajes.com/FCKfiles/file/32413133404.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210919022156.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/9356976547.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/xiretovafiveg.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5691e42c3---vifogex.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/25cdc26bca75d600a5af03da7a49fd08/77976282459.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6b7360f0---bewotafosibigus.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/delebuzupofa.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/56681900085.pdfIn PDF document text
    • http://gewald.ru/content/Files/51966171426.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/biputilixamavemas.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/bovojexoxifata.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/mujowupaxotabapot.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/zimatebabafivupanimaxuz.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/bezebovi.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/sokajir.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/sekozijifexete.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d38f07342b7a352921256d04d5e07d3b/guwulipojuwadumaxubunate.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109300743211025.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pulunaw.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615349ee57ff3---pipafemadubuzer.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/62261915760.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/kimesujijasurolarowo.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/gonadabifawefajufi.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_off0000c319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC319 10704 bytes
SHA-256: 3f3f8f287b1f27e36caa23897229c018594f3f2cc4099148d51a3b8c9b87e949
font_01_sfnt_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 15892 bytes
SHA-256: fb66788dc8f84bc750e2ff12664ab6ce030aac1175e99b299106aa66bf8d5d47
font_02_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.