Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb349d25b7820060…

MALICIOUS

PDF

115.4 KB Created: 2021-09-06 03:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52fd0c10ad41e91155352cab9bfd6cd0 SHA-1: 147fde0fae42d7d64e9e3ce239d9593259ccbe6e SHA-256: cb349d25b782006069191de6a4a3544617dd86a65aad7762b5d75152f02150a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, several of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links and compromised hosting points to a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://theatresaucinema.fr/uploads/file/mesonefedobofesi.pdf In PDF document text
    • https://serka.com/serka/upload/files/pufowakovuboluforitiv.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/douc292saln03745u53g4hpm6t/21426408645.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1477c2bc10f27fceecf6a2aee94f396b/95807192654.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a933259c004f38b39585ef3112c8bce2/karobajedenamenonimotut.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/31298377559.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa5a5f699---kusazavozigibapiwujuna.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/kujeduwirawomigof.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/70420656139.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/kifemololijubovubelazopi.pdfIn PDF document text
    • https://aneri12.eu/res/file/tuvobekodisi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ffeeb1c9a3---sevozubidizelubab.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/94944655860.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/42897563494.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160957acd50aae---61707799268.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/93622340105.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/gorir.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210825_034834.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/90793603475.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/rivuwalipokogoximasiza.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a3ff32ad---58374967816.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/masaxapufanerov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=manuale+italiano+panasonic+ag-ux180PDF 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_off000157df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DF 19524 bytes
SHA-256: 90232461618317345a26fd76d1b874015b043f79c22d4ddba36a96c7af706340
font_01_sfnt_off00018c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C0C 11060 bytes
SHA-256: d2fa1cc70aa93b6a18b0e2d6edbd710c64d6e1cd7f0aec35457df9431f2f470d
font_02_sfnt_off0001a609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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