Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3e6aa3bfa3067a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 11:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e30fd5d9bbdbf3580c76518e0dd7fc4 SHA-1: bb011c3b9209f7429ffa33d94947240fdf8f57eb SHA-256: bd3e6aa3bfa3067ae1d2f420cd363b81f4c71e8660c4a7b0c04bbf3860af4f6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple domains, some of which are associated with compromised CMS uploads or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uniroll.pl/user_images/file/zebegibutop.pdf In PDF document text
    • https://hirurgija.me/files/sofafewusevixodumujunawag.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/vasokezopakejapoge.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/bofuv.pdfIn PDF document text
    • http://szhlfz.net/upload/lutimewadotadogamek.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/51263010053.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/36302971154.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/11449753231.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/bajabodiloxoxezogomejogig.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/35534849343.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4db05d8e92a0a4dfe05fbefdf7a8658f/66704470203.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kenawedonorulew.pdfIn PDF document text
    • http://mariancozma.com/_user/file/kemulipunujaxupuwitaluf.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/3570201238.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/fakolabakegewugijemogo.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/witekapotonej.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4a975c451---vuwaboga.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/rituz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/062b8d9f9fc66ca7a4f9a7354b5aee94/99811169975.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/64604143033.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/74397867096.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6892be9a---66854685060.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/petesawuxigalofumegi.pdfIn PDF document text
    • http://prestopc.it/upload/file/megoloxejoveputemum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=computer+live+wallpaper+downloadPDF 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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 10668 bytes
SHA-256: d4a53193ab98c15345b54f9469f96ef0f3f6fda11cbe1cad7ea81c213b9c7266
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 17448 bytes
SHA-256: 91feceba93dee18a1e962e253a84ce3005e4282cfd45ce7925f7da0565c47fc6
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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