Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f2ffd89e76a472…

MALICIOUS

PDF

68.2 KB Created: 2021-09-06 22:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8da112d52519069f1df924afc334a33 SHA-1: 458030f25aad9310f791665aea83525c1946a640 SHA-256: 32f2ffd89e76a4721b3dfc7e75c47f0210187f77c2aa8dc8cc4eb9dd015efb80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

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 http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/26264197380.pdf In PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8676c0702---dugegufipu.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/96018755571.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/55337336949.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/3711546394.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e6b251eaa72fd670d1e3d856ef187e3d/90614401553.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/79004441896.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/libuk.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/devasezoximaxujemuxor.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/bunizumigo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/sb2j86kak90jf4h1lffdhekj00/revuvovipifegoferaf.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/83989534894.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/uq857e71oh76n79n1jqdpf1jv2/62085304784.pdfIn PDF document text
    • https://servauto.fr/img/user/file/16162075778.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f8ab0d866d11a4d266defd36769c85c4/labidabanami.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/puwaxoxanumepujisog.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/melulefitubib.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/57118366854.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/44003426323.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/jomigaduvubopikonavo.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/dolamexavudivogubawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pals+manual+pdf+freePDF 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_off0000afdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 14616 bytes
SHA-256: d5f6f503f1dafcd0deb9210eaf57e6f6db207bccc15e24a11f13f3f9cfa6fc98
font_02_sfnt_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 10452 bytes
SHA-256: 23f86976c3c98b3d5ab0e2ed5b72b969930d2359130cfd988e4b1ce26e6e8e8b

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