Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a136dc1ffa15a8b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 09:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a04757c4cc9da737e05392dfd2051ad8 SHA-1: 473995a335de67f2ec1fb6289a2386e1218599a1 SHA-256: 3a136dc1ffa15a8b30fb06a8b0f14144126c5c1fb47fd248ee403914800f9f1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://stepasidemedical.com/images/uploads/file/nafumagovor.pdf In PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/vokaxag.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/10922718467.pdfIn PDF document text
    • http://lobi.md/userfiles/file/30841606367.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d3dc488a---37391211463.pdfIn PDF document text
    • http://flomojapan.com/upload/files/kivuwijoxafasugabozi.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/kibagi.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/82984608278.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/nuwofumovukubatelapa.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/remewozexadufos.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/17584968094.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/kolasasunerug.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/77568902169.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/butiwaganizep.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/83788912075.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/44833255303.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/16/47796871461.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/84807207173.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/fativinenolamogajiz.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e296251dc8---mojazavulofovusojabobu.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/rewewotek.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210901_4c445.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1a3521eb07074ba7fa4868f91f91df64/34895356196.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/zetemuluzubarujuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=periodic+properties+of+elements+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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 18060 bytes
SHA-256: ebd829701a33eef7026fe233556a7c46c65c40e08ebfe9bb02c52a4dbe415af6
font_01_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 10620 bytes
SHA-256: d7603be43130cf070e2c6cec7ae7a7b8ef45d8ba709ba240edc181145c8fa060

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