Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb75f583756e9d59…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 14:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8371053a9123e9269cb5b0cd16579f3d SHA-1: 974f4e52bc7ff90f76c9eb80e160efacca9f35a5 SHA-256: bb75f583756e9d59ddbc1ad82585d6fc6ed91bdb0a32f65fe3e660f2bf68fb21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://braciszewska-klimek.pl/fck_files/file/63517924924.pdf In PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/19215599403.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/22110704968.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/27696115287.pdfIn PDF document text
    • http://zenithmetals.com/files/xofuweje.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210908113401.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/lojetopitorurikebaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c71b17506---veteloget.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6e2047dc---newutelilikigojodujod.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/2d1sbp0plu9cvk2ascs1b1o9uu/limegorule.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/zerujis.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/43316560025.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/30347871562.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/bimonosazidigexujan.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/60047614880.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/dojezito.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/9341678364.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/17004429670.pdfIn PDF document text
    • http://dalaichau.com/files/jowezulizozuxodominemakib.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/83870565092.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sevoderubofimowupevedajuf.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/fakizidetakakuna.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/gezerodowexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=soccer+for+androidPDF 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_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 17180 bytes
SHA-256: 4e0a3ccafdebbe484a779f1a65b370cd0640ea9d95da13464eda0900813945a5
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 10232 bytes
SHA-256: 230eeec5bba11805ae19e8fc6eee7e631bc34349feef8ae54a3ac1d548d562e7
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1